{"id":2608,"date":"2025-03-24T08:46:56","date_gmt":"2025-03-23T23:46:56","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=2608"},"modified":"2025-03-24T08:47:25","modified_gmt":"2025-03-23T23:47:25","slug":"%e3%80%90laravel%e5%ae%9f%e8%b7%b5%e3%80%91groupby%e3%81%a7%e5%ae%9f%e7%8f%be%e3%81%99%e3%82%8b%e9%ab%98%e9%80%9f%e3%81%aa%e3%83%87%e3%83%bc%e3%82%bf%e9%9b%86%e8%a8%88-%e3%80%9c%e6%b4%bb%e7%94%a8","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=2608","title":{"rendered":"\u3010Laravel\u5b9f\u8df5\u3011groupBy\u3067\u5b9f\u73fe\u3059\u308b\u9ad8\u901f\u306a\u30c7\u30fc\u30bf\u96c6\u8a08 \u301c\u6d3b\u7528\u4f8b\u3068\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af10\u9078\u301c"},"content":{"rendered":"\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">Laravel groupBy \u306e\u57fa\u790e\u77e5\u8b58<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">groupBy\u30e1\u30bd\u30c3\u30c9\u306e\u52d5\u4f5c\u539f\u7406\u3068\u57fa\u672c\u69cb\u6587<\/a>      <\/li>      <li>        <a href=\"#i-4\">\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u3068groupby\u306e\u95a2\u4fc2\u6027<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-5\">SQL\u306eGROUP BY\u53e5\u3068\u306e\u9055\u3044\u3068\u7279\u5fb4<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-7\">\u5b9f\u8df5\u7684\u306agroupBy\u6d3b\u7528\u30d1\u30bf\u30fc\u30f3<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-8\">\u8907\u6570\u30ad\u30fc\u3092\u4f7f\u7528\u3057\u305f\u30b0\u30eb\u30fc\u30d7\u5316\u306e\u5b9f\u88c5\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-10\">\u9ad8\u5ea6\u306a\u95a2\u6570\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-12\">\u30cd\u30b9\u30c8\u3055\u308c\u305f\u30c7\u30fc\u30bf\u69cb\u9020\u3067\u306e\u52b9\u679c\u7684\u306a\u4f7f\u7528\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-15\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-16\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u51e6\u7406\u6642\u306e\u6ce8\u610f\u70b9<\/a>      <\/li>      <li>        <a href=\"#i-19\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u6700\u9069\u5316\u3059\u308b\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-22\">\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u6d3b\u7528\u3057\u305f\u51e6\u7406\u901f\u5ea6\u306e\u6539\u5584<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-25\">\u5b9f\u88c5\u4f8b\u3067\u5b66\u3076groupBy\u306e\u5fdc\u7528<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-26\">\u58f2\u4e0a\u30c7\u30fc\u30bf\u306e\u6708\u6b21\u96c6\u8a08\u30b7\u30b9\u30c6\u30e0\u306e\u5b9f\u88c5<\/a>      <\/li>      <li>        <a href=\"#i-28\">\u30e6\u30fc\u30b6\u30fc\u30a2\u30af\u30c6\u30a3\u30d3\u30c6\u30a3\u306e\u30ab\u30c6\u30b4\u30ea\u5225\u5206\u6790<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-29\">\u8907\u96d1\u306a\u6761\u4ef6\u3067\u306e\u30ec\u30dd\u30fc\u30c8\u751f\u6210\u30b7\u30b9\u30c6\u30e0<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-30\">groupBy \u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-31\">\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u305d\u306e\u89e3\u6c7a\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-35\">\u30c7\u30d0\u30c3\u30b0\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8a08\u6e2c\u306e\u624b\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-38\">\u4ee3\u66ff\u624b\u6bb5\u306e\u691c\u8a0e\u3068\u9078\u629e\u57fa\u6e96<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-40\">\u767a\u5c55\u7684\u306agroupBy\u6d3b\u7528\u624b\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-41\">\u30ab\u30b9\u30bf\u30e0\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u306e\u62e1\u5f35\u6a5f\u80fd<\/a>      <\/li>      <li>        <a href=\"#i-43\">\u30de\u30af\u30ed\u3092\u4f7f\u7528\u3057\u305f\u72ec\u81ea\u306e\u4e00\u62ec\u51e6\u7406\u306e\u5b9f\u88c5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-44\">\u4ed6\u306eCollection\u30e1\u30bd\u30c3\u30c9\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u30d1\u30bf\u30fc\u30f3<\/a>      <\/li>    <\/ul>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"i-0\">Laravel groupBy \u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">groupBy\u30e1\u30bd\u30c3\u30c9\u306e\u52d5\u4f5c\u539f\u7406\u3068\u57fa\u672c\u69cb\u6587<\/h3>\n\n\n\n<p>Laravel\u306egroupBy\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u5185\u306e\u8981\u7d20\u3092\u6307\u5b9a\u3057\u305f\u30ad\u30fc\u306b\u57fa\u3065\u3044\u3066\u5206\u985e\u3057\u3001\u65b0\u3057\u3044\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u751f\u6210\u3059\u308b\u5f37\u529b\u306a\u6a5f\u80fd\u3067\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30c7\u30fc\u30bf\u306e\u96c6\u8a08\u3084\u5206\u6790\u3092\u52b9\u7387\u7684\u306b\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-2\">\u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u57fa\u672c\u7684\u306a\u69cb\u6587\n$grouped = collect($\u30c7\u30fc\u30bf\u914d\u5217)-&gt;groupBy('\u30ad\u30fc');\n\n\/\/ \u5177\u4f53\u7684\u306a\u4f7f\u7528\u4f8b\n$users = collect([\n    ['name' =&gt; '\u5c71\u7530', 'age' =&gt; 25, 'department' =&gt; '\u55b6\u696d'],\n    ['name' =&gt; '\u9234\u6728', 'age' =&gt; 30, 'department' =&gt; '\u958b\u767a'],\n    ['name' =&gt; '\u4f50\u85e4', 'age' =&gt; 25, 'department' =&gt; '\u55b6\u696d'],\n]);\n\n$groupedByAge = $users-&gt;groupBy('age');\n\/\/ \u7d50\u679c:\n\/\/ [\n\/\/     25 =&gt; [\n\/\/         ['name' =&gt; '\u5c71\u7530', 'age' =&gt; 25, 'department' =&gt; '\u55b6\u696d'],\n\/\/         ['name' =&gt; '\u4f50\u85e4', 'age' =&gt; 25, 'department' =&gt; '\u55b6\u696d']\n\/\/     ],\n\/\/     30 =&gt; [\n\/\/         ['name' =&gt; '\u9234\u6728', 'age' =&gt; 30, 'department' =&gt; '\u958b\u767a']\n\/\/     ]\n\/\/ ]<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-3\">\u30af\u30ed\u30fc\u30b8\u30e3\u3092\u4f7f\u7528\u3057\u305f\u30b0\u30eb\u30fc\u30d7\u5316<\/h4>\n\n\n\n<p>\u3088\u308a\u67d4\u8edf\u306a\u30b0\u30eb\u30fc\u30d7\u5316\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001\u30af\u30ed\u30fc\u30b8\u30e3\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u5e74\u9f62\u309210\u6b73\u533a\u5207\u308a\u3067\u30b0\u30eb\u30fc\u30d7\u5316\u3059\u308b\u4f8b\n$groupedByAgeRange = $users-&gt;groupBy(function ($user) {\n    return floor($user['age'] \/ 10) * 10 . '\u4ee3';\n});<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u3068groupby\u306e\u95a2\u4fc2\u6027<\/h3>\n\n\n\n<p>groupBy\u30e1\u30bd\u30c3\u30c9\u306f\u3001Laravel\u306e<code>Illuminate\\Support\\Collection<\/code>\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u5b9f\u88c5\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u5185\u90e8\u3067\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u51e6\u7406\u3092\u884c\u3063\u3066\u3044\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u65b0\u3057\u3044\u7a7a\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f5c\u6210<\/li>\n\n\n\n<li>\u5404\u8981\u7d20\u306b\u5bfe\u3057\u3066\u30b0\u30eb\u30fc\u30d7\u30ad\u30fc\u3092\u53d6\u5f97<\/li>\n\n\n\n<li>\u30ad\u30fc\u306b\u57fa\u3065\u3044\u3066\u8981\u7d20\u3092\u5206\u985e<\/li>\n\n\n\n<li>\u5206\u985e\u3055\u308c\u305f\u8981\u7d20\u3092\u65b0\u3057\u3044\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3068\u3057\u3066\u307e\u3068\u3081\u308b<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30d1\u30a4\u30d7\u30e9\u30a4\u30f3\u3067\u306e\u4f7f\u7528\u4f8b\n$result = $users\n    -&gt;groupBy('department')  \/\/ \u90e8\u7f72\u3067\u30b0\u30eb\u30fc\u30d7\u5316\n    -&gt;map(function ($group) {  \/\/ \u5404\u30b0\u30eb\u30fc\u30d7\u306b\u5bfe\u3057\u3066\u51e6\u7406\n        return [\n            'count' =&gt; $group-&gt;count(),  \/\/ \u4eba\u6570\n            'average_age' =&gt; $group-&gt;avg('age')  \/\/ \u5e73\u5747\u5e74\u9f62\n        ];\n    });<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">SQL\u306eGROUP BY\u53e5\u3068\u306e\u9055\u3044\u3068\u7279\u5fb4<\/h3>\n\n\n\n<p>Laravel\u306egroupBy\u30e1\u30bd\u30c3\u30c9\u3068SQL\u306eGROUP BY\u53e5\u306b\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u91cd\u8981\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n\n\n<div id=\"id-093999c1-65a3-4b72-808f-8a085ae13a9a\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7279\u5fb4<\/th><th>Laravel groupBy<\/th><th>SQL GROUP BY<\/th><\/tr><\/thead><tbody><tr><td>\u51e6\u7406\u5834\u6240<\/td><td>PHP\u30e1\u30e2\u30ea\u4e0a<\/td><td>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b5\u30fc\u30d0\u30fc<\/td><\/tr><tr><td>\u30c7\u30fc\u30bf\u91cf\u5236\u9650<\/td><td>\u30e1\u30e2\u30ea\u30b5\u30a4\u30ba\u306b\u4f9d\u5b58<\/td><td>DB\u306e\u5236\u9650\u306b\u4f9d\u5b58<\/td><\/tr><tr><td>\u67d4\u8edf\u6027<\/td><td>\u9ad8\u3044\uff08\u30ab\u30b9\u30bf\u30e0\u95a2\u6570\u53ef\uff09<\/td><td>\u57fa\u672c\u7684\u306a\u30b0\u30eb\u30fc\u30d7\u5316\u306e\u307f<\/td><\/tr><tr><td>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/td><td>\u5c0f\u301c\u4e2d\u898f\u6a21\u30c7\u30fc\u30bf\u306b\u6700\u9069<\/td><td>\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306b\u6700\u9069<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h4 class=\"wp-block-heading\" id=\"i-6\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u89b3\u70b9\u3067\u306e\u4f7f\u3044\u5206\u3051<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u4f7f\u7528\u4f8b\uff08\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u51e6\u7406\uff09\n$result = $users\n    -&gt;lazy()  \/\/ \u30ec\u30a4\u30b8\u30fc\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\n    -&gt;groupBy('department')\n    -&gt;map(function ($group) {\n        return $group-&gt;count();\n    });\n\n\/\/ SQL\u3092\u4f7f\u7528\u3057\u305f\u65b9\u304c\u52b9\u7387\u7684\u306a\u4f8b\n$result = DB::table('users')\n    -&gt;select('department', DB::raw('COUNT(*) as count'))\n    -&gt;groupBy('department')\n    -&gt;get();<\/pre>\n\n\n\n<p>\u4ee5\u4e0a\u304c\u3001Laravel groupBy\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u672c\u7684\u306a\u77e5\u8b58\u3068\u306a\u308a\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3088\u308a\u5b9f\u8df5\u7684\u306a\u6d3b\u7528\u30d1\u30bf\u30fc\u30f3\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-7\">\u5b9f\u8df5\u7684\u306agroupBy\u6d3b\u7528\u30d1\u30bf\u30fc\u30f3<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">\u8907\u6570\u30ad\u30fc\u3092\u4f7f\u7528\u3057\u305f\u30b0\u30eb\u30fc\u30d7\u5316\u306e\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u8907\u6570\u306e\u30ad\u30fc\u3092\u4f7f\u7528\u3057\u305f\u30b0\u30eb\u30fc\u30d7\u5316\u306f\u3001\u3088\u308a\u8a73\u7d30\u306a\u5206\u6790\u3084\u96c6\u8a08\u3092\u53ef\u80fd\u306b\u3057\u307e\u3059\u3002Laravel\u3067\u306f\u3001\u914d\u5217\u3084\u30af\u30ed\u30fc\u30b8\u30e3\u3092\u4f7f\u7528\u3057\u3066\u67d4\u8edf\u306a\u5b9f\u88c5\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-9\">\u914d\u5217\u3092\u4f7f\u7528\u3057\u305f\u8907\u6570\u30ad\u30fc\u30b0\u30eb\u30fc\u30d7\u5316<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u90e8\u7f72\u3068\u5e74\u9f62\u5c64\u3067\u30b0\u30eb\u30fc\u30d7\u5316\u3059\u308b\u4f8b\n$employees = collect([\n    ['name' =&gt; '\u5c71\u7530', 'department' =&gt; '\u55b6\u696d', 'age' =&gt; 28, 'sales' =&gt; 1000000],\n    ['name' =&gt; '\u9234\u6728', 'department' =&gt; '\u55b6\u696d', 'age' =&gt; 35, 'sales' =&gt; 1500000],\n    ['name' =&gt; '\u4f50\u85e4', 'department' =&gt; '\u958b\u767a', 'age' =&gt; 28, 'sales' =&gt; 800000],\n]);\n\n$grouped = $employees-&gt;groupBy([\n    'department',\n    function ($item) {\n        return floor($item['age'] \/ 10) * 10 . '\u4ee3';\n    }\n]);\n\n\/\/ \u7d50\u679c:\n\/\/ [\n\/\/     '\u55b6\u696d' =&gt; [\n\/\/         '20\u4ee3' =&gt; [\n\/\/             ['name' =&gt; '\u5c71\u7530', 'department' =&gt; '\u55b6\u696d', 'age' =&gt; 28, 'sales' =&gt; 1000000]\n\/\/         ],\n\/\/         '30\u4ee3' =&gt; [\n\/\/             ['name' =&gt; '\u9234\u6728', 'department' =&gt; '\u55b6\u696d', 'age' =&gt; 35, 'sales' =&gt; 1500000]\n\/\/         ]\n\/\/     ],\n\/\/     '\u958b\u767a' =&gt; [\n\/\/         '20\u4ee3' =&gt; [\n\/\/             ['name' =&gt; '\u4f50\u85e4', 'department' =&gt; '\u958b\u767a', 'age' =&gt; 28, 'sales' =&gt; 800000]\n\/\/         ]\n\/\/     ]\n\/\/ ]<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">\u9ad8\u5ea6\u306a\u95a2\u6570\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>groupBy\u306f\u4ed6\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30e1\u30bd\u30c3\u30c9\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u9ad8\u5ea6\u306a\u51e6\u7406\u304c\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-11\">map\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u306b\u3088\u308b\u96c6\u8a08<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u90e8\u7f72\u3054\u3068\u306e\u58f2\u4e0a\u96c6\u8a08\u3068\u5e73\u5747\u5024\u8a08\u7b97\n$departmentStats = $employees\n    -&gt;groupBy('department')\n    -&gt;map(function ($group) {\n        return [\n            'total_sales' =&gt; $group-&gt;sum('sales'),\n            'average_sales' =&gt; $group-&gt;avg('sales'),\n            'member_count' =&gt; $group-&gt;count(),\n            'members' =&gt; $group-&gt;pluck('name')-&gt;toArray()\n        ];\n    });\n\n\/\/ \u7d50\u679c\u3092\u30bd\u30fc\u30c8\u3057\u3066\u4e0a\u4f4d\u3092\u53d6\u5f97\n$topDepartments = $departmentStats\n    -&gt;sortByDesc('total_sales')\n    -&gt;take(3);<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">\u30cd\u30b9\u30c8\u3055\u308c\u305f\u30c7\u30fc\u30bf\u69cb\u9020\u3067\u306e\u52b9\u679c\u7684\u306a\u4f7f\u7528\u6cd5<\/h3>\n\n\n\n<p>\u30cd\u30b9\u30c8\u3055\u308c\u305f\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u6271\u3046\u5834\u5408\u3001\u30c9\u30c3\u30c8\u8a18\u6cd5\u3084\u30ab\u30b9\u30bf\u30e0\u30af\u30ed\u30fc\u30b8\u30e3\u3092\u4f7f\u7528\u3057\u3066\u52b9\u7387\u7684\u306b\u51e6\u7406\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-13\">\u30c9\u30c3\u30c8\u8a18\u6cd5\u306b\u3088\u308b\u30cd\u30b9\u30c8\u30c7\u30fc\u30bf\u306e\u30b0\u30eb\u30fc\u30d7\u5316<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">$orders = collect([\n    [\n        'id' =&gt; 1,\n        'customer' =&gt; ['name' =&gt; '\u7530\u4e2d', 'region' =&gt; '\u95a2\u6771'],\n        'items' =&gt; [\n            ['product' =&gt; 'A', 'amount' =&gt; 1000],\n            ['product' =&gt; 'B', 'amount' =&gt; 2000]\n        ]\n    ],\n    [\n        'id' =&gt; 2,\n        'customer' =&gt; ['name' =&gt; '\u9234\u6728', 'region' =&gt; '\u95a2\u897f'],\n        'items' =&gt; [\n            ['product' =&gt; 'A', 'amount' =&gt; 1500],\n            ['product' =&gt; 'C', 'amount' =&gt; 3000]\n        ]\n    ]\n]);\n\n\/\/ \u5730\u57df\u3054\u3068\u306e\u6ce8\u6587\u96c6\u8a08\n$regionalOrders = $orders-&gt;groupBy('customer.region')\n    -&gt;map(function ($group) {\n        return [\n            'order_count' =&gt; $group-&gt;count(),\n            'total_amount' =&gt; $group-&gt;flatMap-&gt;items-&gt;sum('amount'),\n            'customers' =&gt; $group-&gt;pluck('customer.name')-&gt;unique()\n        ];\n    });<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-14\">\u8907\u96d1\u306a\u30cd\u30b9\u30c8\u69cb\u9020\u306e\u51e6\u7406<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u8907\u6570\u30ec\u30d9\u30eb\u306e\u30cd\u30b9\u30c8\u3092\u51e6\u7406\u3059\u308b\u9ad8\u5ea6\u306a\u4f8b\n$result = $orders\n    -&gt;groupBy('customer.region')\n    -&gt;map(function ($regionGroup) {\n        return $regionGroup\n            -&gt;flatMap-&gt;items\n            -&gt;groupBy('product')\n            -&gt;map(function ($productGroup) {\n                return [\n                    'total_sales' =&gt; $productGroup-&gt;sum('amount'),\n                    'average_order' =&gt; $productGroup-&gt;avg('amount'),\n                    'order_count' =&gt; $productGroup-&gt;count()\n                ];\n            });\n    });<\/pre>\n\n\n\n<p>\u5b9f\u88c5\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c7\u30fc\u30bf\u306e\u968e\u5c64\u69cb\u9020\u3092\u610f\u8b58\u3057\u305f\u8a2d\u8a08<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b0\u30eb\u30fc\u30d7\u5316\u306e\u9806\u5e8f\u3092\u9069\u5207\u306b\u8a2d\u5b9a<\/li>\n\n\n\n<li>\u4e2d\u9593\u30c7\u30fc\u30bf\u306e\u578b\u3092\u8003\u616e<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u8003\u616e<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u76e3\u8996<\/li>\n\n\n\n<li>\u5fc5\u8981\u306b\u5fdc\u3058\u305f\u30c1\u30e3\u30f3\u30af\u51e6\u7406\u306e\u5c0e\u5165<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>null\u30c1\u30a7\u30c3\u30af\u306e\u5b9f\u88c5<\/li>\n\n\n\n<li>\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306e\u8a2d\u5b9a<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u8907\u96d1\u306a\u30c7\u30fc\u30bf\u5206\u6790\u3084\u96c6\u8a08\u51e6\u7406\u3092\u52b9\u7387\u7684\u306b\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u51e6\u7406\u3092\u3088\u308a\u52b9\u7387\u7684\u306b\u884c\u3046\u305f\u3081\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-15\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-16\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u51e6\u7406\u6642\u306e\u6ce8\u610f\u70b9<\/h3>\n\n\n\n<p>\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3092\u51e6\u7406\u3059\u308b\u969b\u306f\u3001\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3068\u5b9f\u884c\u6642\u9593\u306e\u4e21\u65b9\u3092\u8003\u616e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u52b9\u7387\u7684\u306a\u51e6\u7406\u306e\u305f\u3081\u306e\u4e3b\u8981\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-17\">\u30c1\u30e3\u30f3\u30af\u51e6\u7406\u306e\u5b9f\u88c5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u60aa\u3044\u5b9f\u88c5\n$result = DB::table('large_table')\n    -&gt;get()\n    -&gt;groupBy('category');  \/\/ \u5168\u30c7\u30fc\u30bf\u3092\u30e1\u30e2\u30ea\u306b\u4fdd\u6301\n\n\/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u5b9f\u88c5\n$result = collect();\nDB::table('large_table')\n    -&gt;orderBy('category')\n    -&gt;chunk(1000, function ($records) use (&amp;$result) {\n        $grouped = $records-&gt;groupBy('category');\n        $result = $result-&gt;merge($grouped);\n    });<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-18\">LazyCollection\u306e\u6d3b\u7528<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">use Illuminate\\Support\\LazyCollection;\n\n\/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u51e6\u7406\n$result = LazyCollection::make(function () {\n    $handle = fopen('large_data.csv', 'r');\n    while (($line = fgetcsv($handle)) !== false) {\n        yield [\n            'category' =&gt; $line[0],\n            'value' =&gt; $line[1]\n        ];\n    }\n})\n-&gt;groupBy('category')\n-&gt;map(function ($group) {\n    return [\n        'count' =&gt; $group-&gt;count(),\n        'sum' =&gt; $group-&gt;sum('value')\n    ];\n});<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-19\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u6700\u9069\u5316\u3059\u308b\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6700\u9069\u5316\u306f\u3001\u5927\u898f\u6a21\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306f\u7279\u306b\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-20\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u76e3\u8996\u3068\u5236\u5fa1<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u3059\u308b\u95a2\u6570\nfunction monitorMemory(string $checkpoint): void\n{\n    $memory = memory_get_usage(true);\n    $peak = memory_get_peak_usage(true);\n    Log::info(\"Memory at {$checkpoint}: {$memory} bytes (Peak: {$peak} bytes)\");\n}\n\n\/\/ \u5927\u898f\u6a21\u30c7\u30fc\u30bf\u51e6\u7406\u3067\u306e\u5b9f\u88c5\u4f8b\n$categories = collect();\nDB::table('large_table')\n    -&gt;select('category', DB::raw('COUNT(*) as count'))\n    -&gt;groupBy('category')\n    -&gt;chunk(1000, function ($records) use (&amp;$categories) {\n        monitorMemory('Processing chunk');\n        $categories = $categories-&gt;merge($records);\n\n        \/\/ \u4e0d\u8981\u306a\u30c7\u30fc\u30bf\u306e\u89e3\u653e\n        gc_collect_cycles();\n    });<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-21\">\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u9078\u629e<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u30c7\u30fc\u30bf\u69cb\u9020\nclass EfficientGrouping\n{\n    private $groups = [];\n    private $currentGroup = null;\n    private $currentKey = null;\n\n    public function addItem($key, $value): void\n    {\n        if ($this-&gt;currentKey !== $key) {\n            $this-&gt;finalizeCurrentGroup();\n            $this-&gt;currentKey = $key;\n            $this-&gt;currentGroup = [];\n        }\n        $this-&gt;currentGroup[] = $value;\n    }\n\n    private function finalizeCurrentGroup(): void\n    {\n        if ($this-&gt;currentGroup !== null) {\n            $this-&gt;groups[$this-&gt;currentKey] = $this-&gt;summarizeGroup($this-&gt;currentGroup);\n            $this-&gt;currentGroup = null;\n        }\n    }\n\n    private function summarizeGroup(array $group): array\n    {\n        return [\n            'count' =&gt; count($group),\n            'sum' =&gt; array_sum(array_column($group, 'value'))\n        ];\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-22\">\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u6d3b\u7528\u3057\u305f\u51e6\u7406\u901f\u5ea6\u306e\u6539\u5584<\/h3>\n\n\n\n<p>\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u52b9\u679c\u7684\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u51e6\u7406\u901f\u5ea6\u3092\u5927\u5e45\u306b\u6539\u5584\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-23\">\u30ad\u30e3\u30c3\u30b7\u30e5\u6226\u7565\u306e\u5b9f\u88c5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">use Illuminate\\Support\\Facades\\Cache;\n\nclass CachedGrouping\n{\n    public function getGroupedData(string $key, int $minutes = 60)\n    {\n        return Cache::remember(\"grouped_data:{$key}\", $minutes, function () {\n            return DB::table('large_table')\n                -&gt;select('category', DB::raw('COUNT(*) as count'))\n                -&gt;groupBy('category')\n                -&gt;get()\n                -&gt;mapWithKeys(function ($item) {\n                    return [$item-&gt;category =&gt; $item-&gt;count];\n                });\n        });\n    }\n\n    public function invalidateCache(string $key): void\n    {\n        Cache::forget(\"grouped_data:{$key}\");\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-24\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u4e00\u89a7<\/h4>\n\n\n<div id=\"id-cd7d83fe-9af4-489b-af38-8ca73fc20334\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6700\u9069\u5316\u624b\u6cd5<\/th><th>\u9069\u7528\u30b7\u30fc\u30f3<\/th><th>\u671f\u5f85\u3055\u308c\u308b\u52b9\u679c<\/th><\/tr><\/thead><tbody><tr><td>\u30c1\u30e3\u30f3\u30af\u51e6\u7406<\/td><td>\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8<\/td><td>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u524a\u6e1b<\/td><\/tr><tr><td>LazyCollection<\/td><td>\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u51e6\u7406<\/td><td>\u30e1\u30e2\u30ea\u52b9\u7387\u306e\u5411\u4e0a<\/td><\/tr><tr><td>\u30ad\u30e3\u30c3\u30b7\u30e5\u6d3b\u7528<\/td><td>\u983b\u7e41\u306a\u30a2\u30af\u30bb\u30b9<\/td><td>\u51e6\u7406\u901f\u5ea6\u306e\u6539\u5584<\/td><\/tr><tr><td>\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u69cb\u9020<\/td><td>\u8907\u96d1\u306a\u96c6\u8a08\u51e6\u7406<\/td><td>\u30e1\u30e2\u30ea\u30fbCPU\u52b9\u7387\u306e\u5411\u4e0a<\/td><\/tr><tr><td>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u6700\u9069\u5316<\/td><td>DB\u64cd\u4f5c<\/td><td>\u30af\u30a8\u30ea\u901f\u5ea6\u306e\u6539\u5584<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u5b9f\u88c5\u6642\u306e\u91cd\u8981\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u5b9a\u671f\u7684\u306a\u30c1\u30a7\u30c3\u30af<\/li>\n\n\n\n<li>\u5b9f\u884c\u6642\u9593\u306e\u8a08\u6e2c<\/li>\n\n\n\n<li>\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306e\u7279\u5b9a<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6bb5\u968e\u7684\u306a\u6700\u9069\u5316<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6700\u3082\u52b9\u679c\u306e\u9ad8\u3044\u90e8\u5206\u304b\u3089\u7740\u624b<\/li>\n\n\n\n<li>\u5909\u66f4\u306e\u5f71\u97ff\u3092\u6e2c\u5b9a<\/li>\n\n\n\n<li>\u904e\u5ea6\u306a\u6700\u9069\u5316\u3092\u907f\u3051\u308b<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3067\u3082\u52b9\u7387\u7684\u306a\u51e6\u7406\u304c\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u77e5\u8b58\u3092\u6d3b\u7528\u3057\u305f\u5177\u4f53\u7684\u306a\u5b9f\u88c5\u4f8b\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-25\">\u5b9f\u88c5\u4f8b\u3067\u5b66\u3076groupBy\u306e\u5fdc\u7528<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-26\">\u58f2\u4e0a\u30c7\u30fc\u30bf\u306e\u6708\u6b21\u96c6\u8a08\u30b7\u30b9\u30c6\u30e0\u306e\u5b9f\u88c5<\/h3>\n\n\n\n<p>\u5b9f\u969b\u306e\u30d3\u30b8\u30cd\u30b9\u30b7\u30fc\u30f3\u3067\u983b\u51fa\u3059\u308b\u58f2\u4e0a\u30c7\u30fc\u30bf\u306e\u96c6\u8a08\u30b7\u30b9\u30c6\u30e0\u3092\u5b9f\u88c5\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-27\">\u57fa\u672c\u7684\u306a\u6708\u6b21\u96c6\u8a08\u306e\u5b9f\u88c5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class SalesAggregator\n{\n    public function monthlyReport(Collection $sales, string $year)\n    {\n        return $sales\n            -&gt;filter(function ($sale) use ($year) {\n                return Carbon::parse($sale['date'])-&gt;format('Y') === $year;\n            })\n            -&gt;groupBy(function ($sale) {\n                return Carbon::parse($sale['date'])-&gt;format('Y-m');\n            })\n            -&gt;map(function ($monthSales) {\n                return [\n                    'total_amount' =&gt; $monthSales-&gt;sum('amount'),\n                    'transaction_count' =&gt; $monthSales-&gt;count(),\n                    'average_transaction' =&gt; $monthSales-&gt;avg('amount'),\n                    'highest_transaction' =&gt; $monthSales-&gt;max('amount'),\n                    'products_sold' =&gt; $monthSales-&gt;pluck('product_id')-&gt;unique()-&gt;count()\n                ];\n            });\n    }\n\n    \/\/ \u90e8\u9580\u5225\u30fb\u6708\u6b21\u306e\u30af\u30ed\u30b9\u96c6\u8a08\n    public function departmentMonthlyReport(Collection $sales, string $year)\n    {\n        return $sales\n            -&gt;filter(function ($sale) use ($year) {\n                return Carbon::parse($sale['date'])-&gt;format('Y') === $year;\n            })\n            -&gt;groupBy([\n                function ($sale) {\n                    return $sale['department'];\n                },\n                function ($sale) {\n                    return Carbon::parse($sale['date'])-&gt;format('Y-m');\n                }\n            ])\n            -&gt;map(function ($departmentSales) {\n                return $departmentSales-&gt;map(function ($monthSales) {\n                    return [\n                        'total_amount' =&gt; $monthSales-&gt;sum('amount'),\n                        'achievement_rate' =&gt; $this-&gt;calculateAchievementRate(\n                            $monthSales-&gt;sum('amount'),\n                            $monthSales-&gt;first()['target']\n                        )\n                    ];\n                });\n            });\n    }\n\n    private function calculateAchievementRate($actual, $target): float\n    {\n        return $target &gt; 0 ? round(($actual \/ $target) * 100, 2) : 0;\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-28\">\u30e6\u30fc\u30b6\u30fc\u30a2\u30af\u30c6\u30a3\u30d3\u30c6\u30a3\u306e\u30ab\u30c6\u30b4\u30ea\u5225\u5206\u6790<\/h3>\n\n\n\n<p>\u30e6\u30fc\u30b6\u30fc\u306e\u884c\u52d5\u5206\u6790\u306f\u3001\u30b5\u30fc\u30d3\u30b9\u6539\u5584\u306e\u91cd\u8981\u306a\u6307\u6a19\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class UserActivityAnalyzer\n{\n    public function analyzeUserBehavior(Collection $activities)\n    {\n        \/\/ \u30a2\u30af\u30c6\u30a3\u30d3\u30c6\u30a3\u30bf\u30a4\u30d7\u5225\u306e\u96c6\u8a08\n        $typeAnalysis = $activities\n            -&gt;groupBy('activity_type')\n            -&gt;map(function ($typeActivities) {\n                return [\n                    'total_count' =&gt; $typeActivities-&gt;count(),\n                    'unique_users' =&gt; $typeActivities-&gt;pluck('user_id')-&gt;unique()-&gt;count(),\n                    'average_duration' =&gt; $typeActivities-&gt;avg('duration'),\n                    'peak_hours' =&gt; $this-&gt;analyzePeakHours($typeActivities)\n                ];\n            });\n\n        \/\/ \u30e6\u30fc\u30b6\u30fc\u30bb\u30b0\u30e1\u30f3\u30c8\u5225\u306e\u5206\u6790\n        $segmentAnalysis = $activities\n            -&gt;groupBy('user_segment')\n            -&gt;map(function ($segmentActivities) {\n                return $segmentActivities\n                    -&gt;groupBy('activity_type')\n                    -&gt;map(function ($activities) {\n                        return [\n                            'engagement_rate' =&gt; $this-&gt;calculateEngagementRate($activities),\n                            'retention_rate' =&gt; $this-&gt;calculateRetentionRate($activities)\n                        ];\n                    });\n            });\n\n        return [\n            'type_analysis' =&gt; $typeAnalysis,\n            'segment_analysis' =&gt; $segmentAnalysis\n        ];\n    }\n\n    private function analyzePeakHours(Collection $activities): array\n    {\n        return $activities\n            -&gt;groupBy(function ($activity) {\n                return Carbon::parse($activity['timestamp'])-&gt;format('H');\n            })\n            -&gt;map(function ($hourlyActivities) {\n                return $hourlyActivities-&gt;count();\n            })\n            -&gt;sortDesc()\n            -&gt;take(3)\n            -&gt;toArray();\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-29\">\u8907\u96d1\u306a\u6761\u4ef6\u3067\u306e\u30ec\u30dd\u30fc\u30c8\u751f\u6210\u30b7\u30b9\u30c6\u30e0<\/h3>\n\n\n\n<p>\u8907\u6570\u306e\u6761\u4ef6\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u9ad8\u5ea6\u306a\u30ec\u30dd\u30fc\u30c8\u751f\u6210\u30b7\u30b9\u30c6\u30e0\u306e\u5b9f\u88c5\u4f8b\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class AdvancedReportGenerator\n{\n    public function generateReport(Collection $data, array $conditions)\n    {\n        return $data\n            -&gt;pipe(function ($collection) use ($conditions) {\n                return $this-&gt;applyFilters($collection, $conditions);\n            })\n            -&gt;groupBy($this-&gt;getGroupingCriteria($conditions))\n            -&gt;map(function ($group) use ($conditions) {\n                return [\n                    'summary' =&gt; $this-&gt;calculateSummary($group),\n                    'trends' =&gt; $this-&gt;analyzeTrends($group),\n                    'details' =&gt; $conditions['include_details'] \n                        ? $this-&gt;generateDetails($group)\n                        : null\n                ];\n            });\n    }\n\n    private function applyFilters(Collection $data, array $conditions): Collection\n    {\n        return $data-&gt;filter(function ($item) use ($conditions) {\n            $matches = true;\n            foreach ($conditions['filters'] as $field =&gt; $value) {\n                if (is_array($value)) {\n                    $matches &amp;= in_array($item[$field], $value);\n                } else {\n                    $matches &amp;= $item[$field] === $value;\n                }\n            }\n            return $matches;\n        });\n    }\n\n    private function generateDetails(Collection $group): array\n    {\n        return [\n            'items' =&gt; $group-&gt;take(5)-&gt;values()-&gt;toArray(),\n            'total_count' =&gt; $group-&gt;count(),\n            'date_range' =&gt; [\n                'start' =&gt; $group-&gt;min('date'),\n                'end' =&gt; $group-&gt;max('date')\n            ]\n        ];\n    }\n}<\/pre>\n\n\n\n<p>\u5b9f\u88c5\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u78ba\u4fdd<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5165\u529b\u30c7\u30fc\u30bf\u306e\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3<\/li>\n\n\n\n<li>\u7570\u5e38\u5024\u306e\u691c\u51fa\u3068\u51e6\u7406<\/li>\n\n\n\n<li>\u6b20\u640d\u5024\u306e\u9069\u5207\u306a\u51e6\u7406<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u8003\u616e<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u306e\u307f\u3092\u51e6\u7406<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6700\u9069\u5316<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u4f7f\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4fdd\u5b88\u6027\u306e\u5411\u4e0a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e2\u30b8\u30e5\u30fc\u30eb\u5316\u3055\u308c\u305f\u8a2d\u8a08<\/li>\n\n\n\n<li>\u518d\u5229\u7528\u53ef\u80fd\u306a\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30c9\u30ad\u30e5\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5b9f\u88c5\u4f8b\u306f\u3001\u5b9f\u969b\u306e\u30d3\u30b8\u30cd\u30b9\u30b7\u30fc\u30f3\u3067\u767a\u751f\u3059\u308b\u8981\u4ef6\u306b\u5bfe\u5fdc\u3067\u304d\u308b\u67d4\u8edf\u306a\u8a2d\u8a08\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u5b9f\u88c5\u6642\u306b\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u306e\u3042\u308b\u30c8\u30e9\u30d6\u30eb\u3068\u305d\u306e\u89e3\u6c7a\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-30\">groupBy \u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-31\">\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u305d\u306e\u89e3\u6c7a\u65b9\u6cd5<\/h3>\n\n\n\n<p>groupBy\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u969b\u306b\u3088\u304f\u906d\u9047\u3059\u308b\u30a8\u30e9\u30fc\u3068\u305d\u306e\u5bfe\u51e6\u6cd5\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-32\">1. \u30ad\u30fc\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306e\u30a8\u30e9\u30fc<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u30b1\u30fc\u30b9\n$data = collect([\n    ['id' =&gt; 1],\n    ['id' =&gt; 2, 'category' =&gt; 'A'],\n]);\n\n$grouped = $data-&gt;groupBy('category'); \/\/ Undefined index: category\n\n\/\/ \u89e3\u6c7a\u65b9\u6cd51: \u30c7\u30fc\u30bf\u306e\u4e8b\u524d\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\n$grouped = $data\n    -&gt;filter(function ($item) {\n        return isset($item['category']);\n    })\n    -&gt;groupBy('category');\n\n\/\/ \u89e3\u6c7a\u65b9\u6cd52: nullsafe\u6f14\u7b97\u5b50\u306e\u4f7f\u7528\n$grouped = $data-&gt;groupBy(function ($item) {\n    return $item['category'] ?? 'uncategorized';\n});<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-33\">2. \u578b\u306e\u4e0d\u4e00\u81f4\u306b\u3088\u308b\u30a8\u30e9\u30fc<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u30b1\u30fc\u30b9\n$data = collect([\n    ['category' =&gt; '1'],\n    ['category' =&gt; 1],\n    ['category' =&gt; null],\n]);\n\n\/\/ \u89e3\u6c7a\u65b9\u6cd5: \u578b\u306e\u7d71\u4e00\n$grouped = $data-&gt;groupBy(function ($item) {\n    return is_null($item['category']) ? 'unknown' : (string) $item['category'];\n});<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-34\">3. \u30e1\u30e2\u30ea\u4e0d\u8db3\u30a8\u30e9\u30fc<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30e1\u30e2\u30ea\u4e0d\u8db3\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u306e\u3042\u308b\u30b1\u30fc\u30b9\n$data = DB::table('huge_table')-&gt;get()-&gt;groupBy('category');\n\n\/\/ \u89e3\u6c7a\u65b9\u6cd5: \u30c1\u30e3\u30f3\u30af\u51e6\u7406\u306e\u5b9f\u88c5\n$result = collect();\nDB::table('huge_table')\n    -&gt;orderBy('category')\n    -&gt;chunk(1000, function ($records) use (&amp;$result) {\n        $chunk_result = $records-&gt;groupBy('category');\n        $result = $result-&gt;merge($chunk_result);\n    });<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-35\">\u30c7\u30d0\u30c3\u30b0\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8a08\u6e2c\u306e\u624b\u6cd5<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-36\">\u30c7\u30d0\u30c3\u30b0\u7528\u306e\u30d8\u30eb\u30d1\u30fc\u95a2\u6570<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class GroupByDebugger\n{\n    public static function inspect($collection, $key, $options = [])\n    {\n        $start = microtime(true);\n        $memory_start = memory_get_usage();\n\n        try {\n            $result = $collection-&gt;groupBy($key);\n\n            $time = microtime(true) - $start;\n            $memory = memory_get_usage() - $memory_start;\n\n            return [\n                'success' =&gt; true,\n                'result' =&gt; $result,\n                'stats' =&gt; [\n                    'execution_time' =&gt; round($time, 4) . ' seconds',\n                    'memory_used' =&gt; round($memory \/ 1024 \/ 1024, 2) . ' MB',\n                    'group_count' =&gt; $result-&gt;count(),\n                    'total_items' =&gt; $collection-&gt;count()\n                ]\n            ];\n        } catch (\\Exception $e) {\n            return [\n                'success' =&gt; false,\n                'error' =&gt; $e-&gt;getMessage(),\n                'trace' =&gt; $e-&gt;getTraceAsString()\n            ];\n        }\n    }\n\n    public static function validateGroupKey($collection, $key): array\n    {\n        $issues = [];\n        $collection-&gt;each(function ($item, $index) use ($key, &amp;$issues) {\n            if (!isset($item[$key])) {\n                $issues[] = \"Missing key '{$key}' at index {$index}\";\n            } elseif (is_null($item[$key])) {\n                $issues[] = \"Null value for key '{$key}' at index {$index}\";\n            }\n        });\n        return $issues;\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-37\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8a08\u6e2c\u306e\u5b9f\u88c5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class PerformanceMonitor\n{\n    private static $measurements = [];\n\n    public static function measure(string $label, callable $callback)\n    {\n        $start = microtime(true);\n        $result = $callback();\n        $end = microtime(true);\n\n        self::$measurements[$label] = [\n            'duration' =&gt; round($end - $start, 4),\n            'memory' =&gt; round((memory_get_usage() - $start) \/ 1024 \/ 1024, 2)\n        ];\n\n        return $result;\n    }\n\n    public static function report(): array\n    {\n        return self::$measurements;\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\n$result = PerformanceMonitor::measure('grouping_operation', function () use ($data) {\n    return $data-&gt;groupBy('category');\n});<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-38\">\u4ee3\u66ff\u624b\u6bb5\u306e\u691c\u8a0e\u3068\u9078\u629e\u57fa\u6e96<\/h3>\n\n\n\n<p>\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u3001groupBy\u306e\u4ee3\u66ff\u624b\u6bb5\u3092\u691c\u8a0e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n<div id=\"id-ed4a6c37-d682-41c9-b3c8-6397c4d90851\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u72b6\u6cc1<\/th><th>\u63a8\u5968\u30a2\u30d7\u30ed\u30fc\u30c1<\/th><th>\u30e1\u30ea\u30c3\u30c8<\/th><th>\u30c7\u30e1\u30ea\u30c3\u30c8<\/th><\/tr><\/thead><tbody><tr><td>\u5927\u898f\u6a21\u30c7\u30fc\u30bf<\/td><td>DB\u96c6\u8a08<\/td><td>\u30e1\u30e2\u30ea\u52b9\u7387\u304c\u826f\u3044<\/td><td>\u67d4\u8edf\u6027\u304c\u4f4e\u3044<\/td><\/tr><tr><td>\u8907\u96d1\u306a\u6761\u4ef6<\/td><td>\u30ab\u30b9\u30bf\u30e0\u30ed\u30b8\u30c3\u30af<\/td><td>\u7d30\u304b\u3044\u5236\u5fa1\u304c\u53ef\u80fd<\/td><td>\u5b9f\u88c5\u30b3\u30b9\u30c8\u304c\u9ad8\u3044<\/td><\/tr><tr><td>\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u51e6\u7406<\/td><td>\u30ad\u30e3\u30c3\u30b7\u30e5+\u90e8\u5206\u66f4\u65b0<\/td><td>\u5fdc\u7b54\u304c\u901f\u3044<\/td><td>\u6574\u5408\u6027\u306e\u7ba1\u7406\u304c\u5fc5\u8981<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h4 class=\"wp-block-heading\" id=\"i-39\">\u4ee3\u66ff\u30a2\u30d7\u30ed\u30fc\u30c1\u306e\u5b9f\u88c5\u4f8b<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u306e\u96c6\u8a08\n$dbGrouped = DB::table('items')\n    -&gt;select('category', DB::raw('COUNT(*) as count'))\n    -&gt;groupBy('category')\n    -&gt;get();\n\n\/\/ \u30ab\u30b9\u30bf\u30e0\u30ed\u30b8\u30c3\u30af\u306b\u3088\u308b\u5b9f\u88c5\nclass CustomGrouping\n{\n    private $groups = [];\n\n    public function addItem($item)\n    {\n        $key = $this-&gt;getGroupKey($item);\n        if (!isset($this-&gt;groups[$key])) {\n            $this-&gt;groups[$key] = [];\n        }\n        $this-&gt;groups[$key][] = $item;\n    }\n\n    private function getGroupKey($item)\n    {\n        \/\/ \u30ab\u30b9\u30bf\u30e0\u306e\u30b0\u30eb\u30fc\u30d7\u5316\u30ed\u30b8\u30c3\u30af\n        return $item['category'] ?? 'unknown';\n    }\n\n    public function getResults(): array\n    {\n        return $this-&gt;groups;\n    }\n}<\/pre>\n\n\n\n<p>\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30a8\u30e9\u30fc\u306e\u4e88\u9632<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30c7\u30fc\u30bf\u306e\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3<\/li>\n\n\n\n<li>\u578b\u306e\u4e00\u8cab\u6027\u78ba\u4fdd<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u76e3\u8996<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6700\u9069\u5316<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9069\u5207\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u4f7f\u7528<\/li>\n\n\n\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>\u5fc5\u8981\u6700\u5c0f\u9650\u306e\u30c7\u30fc\u30bf\u51e6\u7406<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c7\u30d0\u30c3\u30b0\u306e\u52b9\u7387\u5316<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30ed\u30b0\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>\u30c7\u30d0\u30c3\u30b0\u30c4\u30fc\u30eb\u306e\u4f7f\u7528<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u306e\u4f5c\u6210<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u624b\u6cd5\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5b89\u5b9a\u3057\u305f\u5b9f\u88c5\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3088\u308a\u767a\u5c55\u7684\u306agroupBy\u306e\u6d3b\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-40\">\u767a\u5c55\u7684\u306agroupBy\u6d3b\u7528\u624b\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-41\">\u30ab\u30b9\u30bf\u30e0\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u306e\u62e1\u5f35\u6a5f\u80fd<\/h3>\n\n\n\n<p>groupBy\u306e\u6a5f\u80fd\u3092\u62e1\u5f35\u3057\u3066\u3001\u3088\u308a\u9ad8\u5ea6\u306a\u96c6\u8a08\u51e6\u7406\u3092\u5b9f\u73fe\u3059\u308b\u65b9\u6cd5\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-42\">\u30ab\u30b9\u30bf\u30e0\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u306e\u5b9f\u88c5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class AdvancedCollection extends Collection\n{\n    \/\/ \u8907\u6570\u6761\u4ef6\u3067\u306e\u52d5\u7684\u30b0\u30eb\u30fc\u30d7\u5316\n    public function groupByMultiple(array $keys)\n    {\n        return $this-&gt;groupBy(function ($item) use ($keys) {\n            return collect($keys)\n                -&gt;map(fn($key) =&gt; data_get($item, $key))\n                -&gt;join('_');\n        });\n    }\n\n    \/\/ \u968e\u5c64\u7684\u30b0\u30eb\u30fc\u30d7\u5316\n    public function groupByHierarchy(array $levels)\n    {\n        return array_reduce($levels, function ($result, $level) {\n            return $result-&gt;groupBy($level);\n        }, $this);\n    }\n\n    \/\/ \u6761\u4ef6\u4ed8\u304d\u30b0\u30eb\u30fc\u30d7\u5316\n    public function groupByWhen($key, $condition)\n    {\n        return $condition ? $this-&gt;groupBy($key) : $this;\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\n$customCollection = new AdvancedCollection([\n    ['dept' =&gt; '\u55b6\u696d', 'team' =&gt; 'A', 'sales' =&gt; 1000],\n    ['dept' =&gt; '\u55b6\u696d', 'team' =&gt; 'B', 'sales' =&gt; 2000],\n    ['dept' =&gt; '\u958b\u767a', 'team' =&gt; 'A', 'sales' =&gt; 1500],\n]);\n\n$result = $customCollection-&gt;groupByHierarchy(['dept', 'team']);<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-43\">\u30de\u30af\u30ed\u3092\u4f7f\u7528\u3057\u305f\u72ec\u81ea\u306e\u4e00\u62ec\u51e6\u7406\u306e\u5b9f\u88c5<\/h3>\n\n\n\n<p>Laravel\u306e\u30de\u30af\u30ed\u6a5f\u80fd\u3092\u5229\u7528\u3057\u3066\u3001groupBy\u30e1\u30bd\u30c3\u30c9\u3092\u62e1\u5f35\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30de\u30af\u30ed\u306e\u767b\u9332\nCollection::macro('groupByWithStats', function ($key) {\n    return $this-&gt;groupBy($key)-&gt;map(function ($group) {\n        return [\n            'items' =&gt; $group,\n            'count' =&gt; $group-&gt;count(),\n            'sum' =&gt; $group-&gt;sum('value'),\n            'avg' =&gt; $group-&gt;avg('value'),\n            'min' =&gt; $group-&gt;min('value'),\n            'max' =&gt; $group-&gt;max('value')\n        ];\n    });\n});\n\n\/\/ \u9ad8\u5ea6\u306a\u96c6\u8a08\u7528\u30de\u30af\u30ed\nCollection::macro('groupByTimeInterval', function ($dateField, $interval = 'month') {\n    return $this-&gt;groupBy(function ($item) use ($dateField, $interval) {\n        $date = Carbon::parse($item[$dateField]);\n        switch ($interval) {\n            case 'month':\n                return $date-&gt;format('Y-m');\n            case 'quarter':\n                return $date-&gt;format('Y') . ' Q' . $date-&gt;quarter;\n            case 'week':\n                return $date-&gt;format('Y-W');\n            default:\n                return $date-&gt;format('Y-m-d');\n        }\n    });\n});\n\n\/\/ \u4f7f\u7528\u4f8b\n$sales-&gt;groupByTimeInterval('transaction_date', 'quarter');<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-44\">\u4ed6\u306eCollection\u30e1\u30bd\u30c3\u30c9\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u30d1\u30bf\u30fc\u30f3<\/h3>\n\n\n\n<p>\u9ad8\u5ea6\u306a\u30c7\u30fc\u30bf\u5206\u6790\u3084\u96c6\u8a08\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306e\u7d44\u307f\u5408\u308f\u305b\u30d1\u30bf\u30fc\u30f3\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class AdvancedAnalytics\n{\n    \/\/ \u8907\u5408\u5206\u6790\u30d1\u30bf\u30fc\u30f3\n    public function analyzeData(Collection $data)\n    {\n        return $data\n            -&gt;groupBy('category')\n            -&gt;map(function ($group) {\n                return $group\n                    -&gt;pipe(function ($items) {\n                        return [\n                            'summary' =&gt; $this-&gt;calculateSummary($items),\n                            'trends' =&gt; $this-&gt;analyzeTrends($items),\n                            'segments' =&gt; $this-&gt;segmentAnalysis($items)\n                        ];\n                    });\n            });\n    }\n\n    \/\/ \u6642\u7cfb\u5217\u5206\u6790\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\n    public function timeSeriesAnalysis(Collection $data)\n    {\n        return $data\n            -&gt;groupBy(function ($item) {\n                return Carbon::parse($item['date'])-&gt;format('Y-m');\n            })\n            -&gt;map(function ($monthData) {\n                return $monthData\n                    -&gt;groupBy('category')\n                    -&gt;map(function ($categoryData) {\n                        return [\n                            'total' =&gt; $categoryData-&gt;sum('amount'),\n                            'moving_average' =&gt; $this-&gt;calculateMovingAverage($categoryData),\n                            'growth_rate' =&gt; $this-&gt;calculateGrowthRate($categoryData)\n                        ];\n                    });\n            });\n    }\n\n    \/\/ \u9ad8\u5ea6\u306a\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\n    public function advancedFiltering(Collection $data, array $criteria)\n    {\n        return $data\n            -&gt;filter(function ($item) use ($criteria) {\n                return collect($criteria)-&gt;every(function ($value, $key) use ($item) {\n                    return $item[$key] === $value;\n                });\n            })\n            -&gt;groupBy(function ($item) {\n                return Carbon::parse($item['date'])-&gt;format('Y-m');\n            })\n            -&gt;map(function ($group) {\n                return $this-&gt;calculateMetrics($group);\n            });\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-45\">\u9ad8\u5ea6\u306a\u96c6\u8a08\u30d1\u30bf\u30fc\u30f3\u306e\u4f8b<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u591a\u6b21\u5143\u5206\u6790\n$result = $data\n    -&gt;groupBy('category')\n    -&gt;map(function ($categoryGroup) {\n        return $categoryGroup\n            -&gt;groupBy('status')\n            -&gt;map(function ($statusGroup) {\n                return [\n                    'count' =&gt; $statusGroup-&gt;count(),\n                    'value_distribution' =&gt; $statusGroup\n                        -&gt;groupBy(function ($item) {\n                            return floor($item['value'] \/ 1000) * 1000;\n                        })\n                        -&gt;map-&gt;count(),\n                    'date_range' =&gt; [\n                        'start' =&gt; $statusGroup-&gt;min('date'),\n                        'end' =&gt; $statusGroup-&gt;max('date')\n                    ]\n                ];\n            });\n    });\n\n\/\/ \u6642\u7cfb\u5217\u30d1\u30bf\u30fc\u30f3\u5206\u6790\n$patterns = $data\n    -&gt;groupBy(function ($item) {\n        return Carbon::parse($item['date'])-&gt;format('Y-m');\n    })\n    -&gt;map(function ($monthGroup) {\n        return $monthGroup\n            -&gt;groupBy('pattern_type')\n            -&gt;map(function ($patternGroup) {\n                return [\n                    'frequency' =&gt; $patternGroup-&gt;count(),\n                    'distribution' =&gt; $patternGroup\n                        -&gt;groupBy('sub_type')\n                        -&gt;map-&gt;count(),\n                    'metrics' =&gt; $this-&gt;calculatePatternMetrics($patternGroup)\n                ];\n            });\n    });<\/pre>\n\n\n\n<p>\u5b9f\u88c5\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u62e1\u5f35\u6027\u306e\u78ba\u4fdd<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e2\u30b8\u30e5\u30fc\u30eb\u5316\u3055\u308c\u305f\u8a2d\u8a08<\/li>\n\n\n\n<li>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u7d71\u4e00<\/li>\n\n\n\n<li>\u518d\u5229\u7528\u53ef\u80fd\u306a\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6700\u9069\u5316<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u8003\u616e<\/li>\n\n\n\n<li>\u51e6\u7406\u306e\u52b9\u7387\u5316<\/li>\n\n\n\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6d3b\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b3\u30fc\u30c9\u306e\u4fdd\u5b88\u6027<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u547d\u540d\u898f\u5247\u306e\u7d71\u4e00<\/li>\n\n\n\n<li>\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u6574\u5099<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u306e\u5145\u5b9f<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u767a\u5c55\u7684\u306a\u624b\u6cd5\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u67d4\u8edf\u3067\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u51e6\u7406\u304c\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; 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