{"id":22704,"date":"2017-05-08T13:33:54","date_gmt":"2017-05-08T04:33:54","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=22704"},"modified":"2024-05-06T11:42:10","modified_gmt":"2024-05-06T02:42:10","slug":"%e3%80%90php%e5%85%a5%e9%96%80%e3%80%91%e9%85%8d%e5%88%97%e3%81%ae%e3%82%ad%e3%83%bc%e3%82%92%e5%8f%96%e5%be%97%e3%81%99%e3%82%8barray_keys","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/22704","title":{"rendered":"\u3010PHP\u5165\u9580\u3011array_keys\u95a2\u6570\u3067\u914d\u5217\u3084\u9023\u60f3\u914d\u5217\u306e\u30ad\u30fc\u3092\u53d6\u5f97\u3059\u308b"},"content":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\uff01\u30e9\u30a4\u30bf\u30fc\u306emuramatsu\u3067\u3059\u3002<\/p>\n<p>PHP\u3067\u306f\u914d\u5217\u3092\u4f7f\u7528\u3057\u3066\u3055\u307e\u3056\u307e\u306a\u51e6\u7406\u304c\u53ef\u80fd\u3067\u3059\u3088\u306d\u3002<br \/>\n\u4eca\u56de\u306f\u914d\u5217\u306e\u51e6\u7406\u306e\u4e2d\u3067\u3082\u3001\u914d\u5217\u306e\u30ad\u30fc\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u3092\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001<\/p>\n<ul>\n<li><span style=\"color: #f75959;\"><strong>array_keys\u95a2\u6570\u3068\u306f<\/strong><\/span><\/li>\n<li><span style=\"color: #f75959;\"><strong>array_keys\u95a2\u6570\u306e\u4f7f\u3044\u65b9<\/strong><\/span><\/li>\n<\/ul>\n<p>\u3068\u3044\u3046\u57fa\u672c\u7684\u306a\u5185\u5bb9\u304b\u3089\u3001<\/p>\n<ul>\n<li><span style=\"color: #f75959;\"><strong>array_key_exists\u3067\u914d\u5217\u306e\u30ad\u30fc\u304c\u3042\u308b\u304b\u78ba\u8a8d\u3059\u308b\u65b9\u6cd5<\/strong><\/span><\/li>\n<li><span style=\"color: #f75959;\"><strong>array_keys\u95a2\u6570\u3068foreach\u6587\u3092\u4f7f\u7528\u3057\u305f\u30ad\u30fc\u53d6\u5f97\u901f\u5ea6\u306e\u691c\u8a3c<\/strong><\/span><\/li>\n<\/ul>\n<p>\u306a\u3069\u306e\u5fdc\u7528\u7684\u306a\u4f7f\u3044\u65b9\u306b\u95a2\u3057\u3066\u3082\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>\u3055\u3063\u305d\u304f\u3001<span style=\"color: #f75959; background-color: #ffff99;\"><strong>array_keys\u95a2\u6570\u306b\u3064\u3044\u3066\u30de\u30b9\u30bf\u30fc\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/strong><\/span><\/p>\n<h2>array_keys\u95a2\u6570\u3068\u306f<\/h2>\n<p><span style=\"color: #54a870;\"><strong>array_keys<\/strong><\/span>\u306f\u3001\u914d\u5217\u306e\u30ad\u30fc\u3068\u547c\u3070\u308c\u308b<span style=\"color: #254df2;\"><strong>\u8981\u7d20\u756a\u53f7\u307e\u305f\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30ad\u30fc\u3092\u53d6\u5f97<\/strong><\/span>\u3057\u3066\u304f\u308c\u308b\u95a2\u6570\u3067\u3059\u3002<\/p>\n<p>\u914d\u5217\u306e\u4e2d\u306b\u3042\u308b\u8981\u7d20\u3092\u6307\u5b9a\u3057\u3066\u305d\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30ad\u30fc\u3092\u8abf\u3079\u305f\u308a\u3001\u8981\u7d20\u756a\u53f7\u3092\u5168\u3066\u53d6\u5f97\u3057\u3066\u914d\u5217\u306e\u4e2d\u306b\u3044\u304f\u3064\u8981\u7d20\u304c\u3042\u308b\u304b\u3092\u8abf\u3079\u308b\u4e8b\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><strong>\u57fa\u672c\u69cb\u6587<\/strong><\/p>\n<div style=\"padding: 10px 5px 10px 20px; margin-bottom: 20px; border: 2px solid #585858;\"><strong>array_keys( $\u914d\u5217\u540d [, $\u5024 [, bool ]] )<\/strong><\/div>\n<p><strong>\u7b2c\u4e00\u5f15\u6570<\/strong>\u306b\u5bfe\u8c61\u306e$\u914d\u5217\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u7b2c\u4e8c\u5f15\u6570<\/strong>\u306b$\u5024\u3092\u6307\u5b9a\u3057\u305f\u5834\u5408\u306f\u3001<span style=\"color: #254df2;\"><strong>\u6307\u5b9a\u3057\u305f\u30ad\u30fc\u3092\u8fd4\u3057\u307e\u3059\u3002<\/strong><\/span><br \/>\n\u6307\u5b9a\u3057\u305f$\u5024\u304c\u7121\u304b\u3063\u305f\u5834\u5408\u306f\u3001\u7a7a\u306e\u914d\u5217\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002<\/p>\n<p><strong>\u7b2c\u4e09\u5f15\u6570<\/strong>\u306ebool(\u771f\u507d\u5024)\u306bTure\u3092\u6307\u5b9a\u3057\u305f\u5834\u5408\u306f\u3001<span style=\"color: #54a870;\"><strong>\u8981\u7d20\u306e\u578b\u306e\u6bd4\u8f03 (===)<\/strong><\/span>\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306f<span style=\"color: #f75959;\"><strong>False<\/strong><\/span>\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3082\u3057\u914d\u5217\u306b\u95a2\u3057\u3066\u307e\u3060\u3088\u304f\u5206\u304b\u3089\u306a\u3044\u65b9\u306f\u4ee5\u4e0b\u306e\u914d\u5217\u30fb\u9023\u60f3\u914d\u5217\u306e\u4f7f\u3044\u65b9\u306e\u8a18\u4e8b\u3092\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u306d\u3002<br \/>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/11981\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/06\/php_eye_new-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">10\u5206\u3067\u4e38\u308f\u304b\u308a\uff01PHP\u306e\u914d\u5217(array)\u306e\u57fa\u790e\u304b\u3089\u5fdc\u7528\u307e\u3067\u89e3\u8aac<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            <\/p>\n<h2>array_keys\u306e\u4f7f\u3044\u65b9<\/h2>\n<h3>\u914d\u5217\u306e\u30ad\u30fc\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5<\/h3>\n<p>\u3067\u306f\u5b9f\u969b\u306b\u3001array_keys\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u914d\u5217\u3068\u9023\u60f3\u914d\u5217\u306e\u30ad\u30fc\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><strong>\u914d\u5217<\/strong><br \/>\n\u307e\u305a\u306f\u57fa\u672c\u7684\u306a\u914d\u5217\u306e\u5834\u5408\u3067\u3059\u3002<\/p>\n<p>\u914d\u5217$fruits\u306e\u8981\u7d20\u756a\u53f7\u3092\u53d6\u5f97\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/p>\n<pre class=\"lang:php decode:true \">&lt;?php\r\n\r\n$fruits = [\r\n           'apple',\r\n           'orange',\r\n           'melon',\r\n           'banana',\r\n           'pineapple'\r\n          ];\r\n \r\n\/\/array_keys\u3067\u914d\u5217\u306e\u30ad\u30fc\u3092\u53d6\u5f97\u3059\u308b\r\n$fruits_key = array_keys($fruits);\r\n \r\nprint_r($fruits_key);\r\n\r\n?&gt;\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<div style=\"padding: 10px 5px 10px 20px; margin-bottom: 20px; border: 2px solid #585858;\">Array ( [0] =&gt; 0 [1] =&gt; 1 [2] =&gt; 2 [3] =&gt; 3 [4] =&gt; 4 )<\/div>\n<p>\u81ea\u52d5\u7684\u306b\u8981\u7d20\u756a\u53f7\u304c\u632f\u3089\u308c\u3001\u8981\u7d20\u6570\u5206\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30ad\u30fc\u304c\u53d6\u5f97\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><strong><br \/>\n\u9023\u60f3\u914d\u5217<\/strong><br \/>\n\u60f3\u914d\u5217\u306e\u30ad\u30fc\u3092\u53d6\u5f97\u3059\u308b\u5834\u5408\u3082\u3001\u57fa\u672c\u7684\u306b<span style=\"color: #254df2;\"><strong>1\u6b21\u5143\u914d\u5217\u3068\u540c\u3058\u65b9\u6cd5\u3067\u53ef\u80fd<\/strong><\/span>\u3067\u3059\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/p>\n<pre class=\"lang:php decode:true \">&lt;?php\r\n\r\n$value_array = ['A'=&gt;100, 'B'=&gt;200, 'C'=&gt;300, 'D'=&gt;400, 'E'=&gt;500];\r\n\r\n\/\/array_keys\u3067\u914d\u5217\u306e\u30ad\u30fc\u3092\u53d6\u5f97\u3059\u308b\r\n$value_key = array_keys($value_array);\r\n\r\nvar_dump($value_key);\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<div style=\"padding: 10px 5px 10px 20px; margin-bottom: 20px; border: 2px solid #585858;\">Array ( [0] =&gt; A [1] =&gt; B [2] =&gt; C [3] =&gt; D [4] =&gt; E )<\/div>\n<p>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30ad\u30fc\u304c\u53d6\u5f97\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n<h3>\u6307\u5b9a\u3057\u305f\u5024\u306e\u30ad\u30fc\u306e\u307f\u3092\u53d6\u5f97\u3059\u308b<\/h3>\n<p><span style=\"color: #254df2;\"><strong>\u6307\u5b9a\u3057\u305f\u914d\u5217\u306e\u8981\u7d20\u306e\u30ad\u30fc\u306e\u307f\u3092\u53d6\u5f97<\/strong><\/span>\u3057\u305f\u3044\u5834\u5408\u306f\u3001array_keys\u95a2\u6570\u306e\u7b2c\u4e8c\u5f15\u6570\u306b\u914d\u5217\u306e\u8981\u7d20\u306b\u542b\u307e\u308c\u308b<span style=\"color: #254df2;\"><strong>\u5024\u3092\u6307\u5b9a<\/strong><\/span>\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u914d\u5217<\/strong><br \/>\n\u307e\u305a\u306f\u914d\u5217\u306e\u5834\u5408\u3067\u3001array_keys\u95a2\u6570\u306e\u7b2c\u4e8c\u5f15\u6570\u3092\u6307\u5b9a\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/p>\n<pre class=\"lang:php decode:true \">&lt;?php\r\n\r\n\r\n$yen = [\r\n        '100\u5186',\r\n        '150\u5186',\r\n        '300\u5186',\r\n        '200\u5186',\r\n        '500\u5186'];\r\n \r\n$yen_key = array_keys($yen, '150\u5186');\r\n  \r\nprint_r($yen_key);\r\n\r\n?&gt;\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<div style=\"padding: 10px 5px 10px 20px; margin-bottom: 20px; border: 2px solid #585858;\">Array ( [0] =&gt; 1 )<\/div>\n<p>\u81ea\u52d5\u7684\u306b\u8981\u7d20\u756a\u53f7\u304c\u632f\u3089\u308c\u30010\u756a\u76ee\u304b\u3089\u6570\u3048\u30661\u756a\u76ee\u306b\u5024150\u5186\u304c\u4f4d\u7f6e\u3057\u3066\u3044\u308b\u4e8b\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<p><strong><br \/>\n\u9023\u60f3\u914d\u5217<\/strong><br \/>\n\u6b21\u306b\u9023\u60f3\u914d\u5217\u306e\u5834\u5408\u3067\u3001\u6307\u5b9a\u3057\u305f\u5024\u304c2\u3064\u3042\u308b\u3068\u3069\u3046\u306a\u308b\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/p>\n<pre class=\"lang:php decode:true \">&lt;?php\r\n\r\n$fruits = [\r\n           'apple'=&gt;'100\u5186',\r\n           'orange'=&gt;'150\u5186',\r\n           'melon'=&gt;'300\u5186',\r\n           'banana'=&gt;'200\u5186',\r\n           'peach' =&gt; '150\u5186',\r\n           'pineapple'=&gt;'500\u5186'\r\n          ];\r\n \r\n$fruits_key = array_keys($fruits, '150\u5186');\r\n \r\nprint_r($fruits_key);\r\n\r\n?&gt;\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<div style=\"padding: 10px 5px 10px 20px; margin-bottom: 20px; border: 2px solid #585858;\">Array ( [0] =&gt; orange [1] =&gt; peach )<\/div>\n<p>\u30b5\u30f3\u30d7\u30eb\u3067\u306farray_keys\u95a2\u6570\u306e\u7b2c\u4e8c\u5f15\u6570\u306b\u914d\u5217\u306e\u5024150\u5186\u3092\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u5b9f\u884c\u7d50\u679c\u306e\u3068\u304a\u308a\u3001<span style=\"color: #254df2;\"><strong>\u6307\u5b9a\u3057\u305f\u5024\u306e\u30ad\u30fc\u3067\u3042\u308borange\u3068peach\u304c\u53d6\u5f97<\/strong><\/span>\u3055\u308c\u3066\u3001\u65b0\u3057\u3044\u914d\u5217\u306b\u5165\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<h3>\u578b\u307e\u3067\u6307\u5b9a\u3057\u305f\u5024\u306e\u30ad\u30fc\u3092\u53d6\u5f97\u3059\u308b<\/h3>\n<p><span style=\"color: #254df2;\"><strong>\u578b\u3092\u6307\u5b9a\u3057\u305f\u914d\u5217\u306e\u8981\u7d20\u306e\u30ad\u30fc\u306e\u307f<\/strong><\/span>\u3092\u53d6\u5f97\u3057\u305f\u3044\u5834\u5408\u306f\u3001array_keys\u95a2\u6570\u306e\u7b2c\u4e09\u5f15\u6570\u306b<span style=\"color: #254df2;\"><strong>True<\/strong><\/span>\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p>\u307e\u305a\u306f<strong>\u578b\u3092\u6307\u5b9a\u3057\u306a\u3044<\/strong>\u5834\u5408\u3067\u307f\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c91<\/p>\n<pre class=\"lang:php decode:true \">&lt;?php\r\n$fruits = [\r\n           'apple'=&gt;'100',\r\n           'orange'=&gt;'150',\r\n           'melon'=&gt;'300',\r\n           'banana'=&gt;'200',\r\n           'pineapple'=&gt;'500',\r\n           'grape'=&gt; 300,\r\n           'peach' =&gt; 150\r\n          ];\r\n \r\n$fruits_key = array_keys($fruits, '300');\r\n \r\nprint_r($fruits_key);\r\n\r\n?&gt;\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<div style=\"padding: 10px 5px 10px 20px; margin-bottom: 20px; border: 2px solid #585858;\">Array ( [0] =&gt; melon [1] =&gt; grape )<\/div>\n<p>\u7b2c\u4e8c\u5f15\u6570\u3067\u5024 \u2019300\u2019 \u3092\u6307\u5b9a\u3044\u308b\u306e\u3067\u3001\u578b\u306f\u95a2\u4fc2\u306a\u304f\u3001\u5024\u304c <span style=\"color: #254df2;\"><strong>\u2019300\u2019 \u306emelon\u30ad\u30fc <\/strong><\/span>\u3068\u5024\u304c <span style=\"color: #254df2;\"><strong>300 \u306egrape\u30ad\u30fc\u304c\u53d6\u5f97<\/strong><\/span>\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<p>\u7b2c\u4e09\u5f15\u6570\u3092\u6307\u5b9a\u3057\u306a\u3044\u5834\u5408\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u304c<span style=\"color: #f75959;\"><strong>False<\/strong><\/span>\u3068\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u578b\u306e\u6307\u5b9a\u306f\u3055\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>\u3067\u306f\u6b21\u306b\u3001\u7b2c\u4e09\u5f15\u6570\u306bTure\u3092\u5165\u308c\u3066<strong>\u578b\u3092\u6307\u5b9a<\/strong>\u3057\u305f\u5834\u5408\u3067\u307f\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c92<\/p>\n<pre class=\"lang:php decode:true \">&lt;?php\r\n$fruits = [\r\n           'apple'=&gt;'100',\r\n           'orange'=&gt;'150',\r\n           'melon'=&gt;'300',\r\n           'banana'=&gt;'200',\r\n           'pineapple'=&gt;'500',\r\n           'grape'=&gt; 300,\r\n           'peach' =&gt; 150\r\n          ];\r\n \r\n$fruits_key = array_keys($fruits, '300', true);\r\n \r\nprint_r($fruits_key);\r\n\r\n?&gt;\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<div style=\"padding: 10px 5px 10px 20px; margin-bottom: 20px; border: 2px solid #585858;\">Array ( [0] =&gt; melon )<\/div>\n<p>\u578b\u3092\u6307\u5b9a\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u2019300\u2019 \u306e\u5024\u306b\u578b\u3082\u3074\u3063\u305f\u308a\u5408\u3063\u305f<span style=\"color: #254df2;\"><strong>melon\u30ad\u30fc\u306e\u307f\u3092\u53d6\u5f97<\/strong><\/span>\u3057\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n<p>\u5024\u306e\u578b\u307e\u3067\u3082\u53b3\u5bc6\u306b\u6bd4\u8f03\u3057\u305f\u3044\u5834\u5408\u306f\u3001array_keys\u95a2\u6570\u306e\u7b2c\u4e09\u5f15\u6570\u306b<span style=\"color: #254df2;\"><strong>True<\/strong><\/span>\u3092\u6307\u5b9a\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>array_key_exists\u95a2\u6570\u3067\u914d\u5217\u306e\u30ad\u30fc\u304c\u3042\u308b\u304b\u78ba\u8a8d\u3059\u308b<\/h2>\n<p>\u914d\u5217\u306e\u30ad\u30fc\u3092\u53d6\u5f97\u3059\u308b\u524d\u306b\u3001<span style=\"color: #f75959;\"><strong>\u30ad\u30fc\u304c\u672c\u5f53\u306b\u5b58\u5728\u3059\u308b\u304b\u5206\u304b\u3089\u306a\u3044<\/strong><\/span>\u3001\u3068\u3044\u3046\u3053\u3068\u304c\u3042\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u3053\u3067<span style=\"color: #54a870;\"><strong>array_key_exists\u95a2\u6570<\/strong><\/span>\u3092\u4f7f\u3063\u3066\u3001\u5148\u306b\u30ad\u30fc\u306e\u6709\u7121\u3092\u78ba\u8a8d\u3059\u308b\u4e8b\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u914d\u5217\u306e\u30ad\u30fc\u304c\u3042\u308b\u304b\u5fc3\u914d\u306b\u306a\u3063\u305f\u3089\u3001\u307e\u305a\u306f\u3053\u3053\u304b\u3089\u8a66\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><span style=\"color: #54a870;\"><strong>array_key_exists\u95a2\u6570<\/strong><\/span>\u306b\u3064\u3044\u3066\u306f\u3001\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/22538\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/06\/image-122-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010PHP\u5165\u9580\u3011array_key_exists\u95a2\u6570\u3067\u914d\u5217\u306e\u30ad\u30fc\u306e\u6709\u7121\u3092\u8abf\u3079\u308b<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            <\/p>\n<p>\u307e\u305f<span style=\"color: #54a870;\"><strong>array\u95a2\u6570<\/strong><\/span>\u306b\u3064\u3044\u3066\u3082\u3063\u3068\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u65b9\u3001\u914d\u5217\u3092\u64cd\u4f5c\u3059\u308b\u3055\u307e\u3056\u307e\u306a\u95a2\u6570\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u306f\u3001\u4ee5\u4e0b\u306e\u8a18\u4e8b\u306b\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u3053\u3061\u3089\u3082\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u306d\uff01<br \/>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/25512\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/06\/image10-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010\u521d\u5fc3\u8005\u5fc5\u898b\uff01\u3011PHP\u306e\u3088\u304f\u4f7f\u3046\u914d\u5217\u64cd\u4f5c\u306e\u95a2\u6570\u307e\u3068\u3081(array)<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            <\/p>\n<h2>\u901f\u5ea6\u9762<\/h2>\n<p>array_keys\u95a2\u6570\u306f\u914d\u5217\u306e\u30ad\u30fc\u3092\u53d6\u5f97\u3059\u308b\u3068\u304d\u306b\u4fbf\u5229\u3067\u3059\u304c\u3001\u901f\u5ea6\u9762\u3067\u306f\u3069\u3046\u306a\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>\u3053\u3053\u3067\u306farray_keys\u95a2\u6570\u3067\u914d\u5217\u306e\u30ad\u30fc\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u3068\u3001<span style=\"color: #54a870;\"><strong>foreach<\/strong><\/span>\u306b\u3088\u308b\u30eb\u30fc\u30d7\u51e6\u7406\u306e\u4e2d\u3067\u914d\u5217\u306e\u30ad\u30fc\u306e\u307f\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u3067\u3001\u3069\u3061\u3089\u304c<span style=\"color: #254df2;\"><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u512a\u308c\u3066\u3044\u308b\u304b\u6bd4\u8f03<\/strong><\/span>\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n<p>\u6bd4\u8f03\u306b\u306f<span style=\"color: #54a870;\"><strong>microtime<\/strong><\/span>\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3001\u30eb\u30fc\u30d7\u306e\u4e2d\u3067100000\u56de\u914d\u5217\u306e\u8981\u7d20\u3092\u8ffd\u52a0\u3057\u3001\u914d\u5217\u306e\u30ad\u30fc\u3092\u3069\u3061\u3089\u304c\u65e9\u304f\u53d6\u5f97\u3067\u304d\u308b\u304b\u6bd4\u8f03\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"lang:php decode:true \">&lt;?php\r\n\r\n\/\/\u30ad\u30fc\u3068\u5024\u3092100000\u56de\u8ffd\u52a0\u3059\u308b\r\nfor ($i = 0 ; $i &lt; 100000 ; $i++){\r\n\r\n  $array[] = [$i=&gt;'array'];\r\n}\r\n\r\n\/\/ array_keys\u95a2\u6570\u306b\u3088\u308b\u30ad\u30fc\u53d6\u5f97\r\n$start1 = microtime(true);\r\n$array_keys1 = array_keys($array);\r\n$end1 = microtime(true) - $start1;\r\n\r\necho 'array_keys : '.$end1 .'\u79d2';\r\necho '&lt;br&gt;';\r\n\r\n\/\/ foreach\u306b\u3088\u308b\u30ad\u30fc\u53d6\u5f97\r\n$start2 = microtime(true);\r\nforeach($array as $key =&gt; $value){\r\n\r\n  $array_keys2[] = $key;\r\n}\r\n$end2 = microtime(true) - $start2;\r\necho 'foreach : '.$end2 .'\u79d2';\r\n\r\n?&gt;\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \" >\r\n\u5b9f\u884c\u7d50\u679c\uff1a1\u56de\u76ee\r\narray_keys : 0.00322890281677\u79d2\r\nforeach : 0.0219061374664\u79d2\r\n\u5b9f\u884c\u7d50\u679c\uff1a2\u56de\u76ee\r\narray_keys : 0.00240707397461\u79d2\r\nforeach : 0.0243449211121\u79d2\r\n\u5b9f\u884c\u7d50\u679c\uff1a3\u56de\u76ee\r\narray_keys : 0.0025200843811\u79d2\r\nforeach : 0.0264029502869\u79d2\r\n<\/pre>\n<p>3\u56de\u78ba\u8a8d\u3057\u305f\u7d50\u679c\u3001foreach\u6587\u3092\u4f7f\u7528\u3057\u305f\u30ad\u30fc\u53d6\u5f97\u51e6\u7406\u306e\u307b\u3046\u304c\u51e6\u7406\u304c\u9045\u304f\u3001<span style=\"color: #254df2;\"><strong>array_keys\u95a2\u6570\u3092\u6307\u5b9a\u3057\u305f\u307b\u3046\u304c\u5727\u5012\u7684\u306b\u65e9\u3044<\/strong><\/span>\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\uff01<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u3053\u3053\u3067\u306f\u3001<\/p>\n<ul>\n<li><span style=\"color: #254df2;\"><strong>array_keys\u95a2\u6570\u3068\u306f\uff1f<\/strong><\/span><\/li>\n<li><span style=\"color: #254df2;\"><strong>\u914d\u5217\u306e\u30ad\u30fc\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5<\/strong><\/span><\/li>\n<li><span style=\"color: #254df2;\"><strong>\u6307\u5b9a\u3057\u305f\u5024\u306e\u30ad\u30fc\u306e\u307f\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5<\/strong><\/span><\/li>\n<li><span style=\"color: #254df2;\"><strong>\u578b\u307e\u3067\u6307\u5b9a\u3057\u305f\u5024\u306e\u30ad\u30fc\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5<\/strong><\/span><\/li>\n<\/ul>\n<p>\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u306e\u89e3\u8aac\u3092\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u307e\u305f\u5fdc\u7528\u7de8\u3068\u3057\u3066\u3001\u914d\u5217\u306e\u30ad\u30fc\u304c\u5b58\u5728\u3059\u308b\u304b\u5206\u304b\u3089\u306a\u3044\u6642\u306b\u4f7f\u3046array_key_exists\u95a2\u6570\u306e\u4f7f\u3044\u65b9\u3084\u3001\u901f\u5ea6\u9762\u306e\u691c\u8a3c\u306a\u3069\u3082\u8aac\u660e\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>array_keys\u95a2\u6570\u306f\u3001<span style=\"color: #f75959;\"><strong>\u914d\u5217\u306e\u8981\u7d20\u304c\u3044\u304f\u3064\u5408\u3063\u305f\u304b<\/strong><\/span>\u3001<span style=\"color: #f75959;\"><strong>\u540c\u3058\u5024\u306e\u5165\u3063\u305f\u30ad\u30fc\u304c\u5e7e\u3064\u3042\u308b\u306e\u304b<\/strong><\/span>\u306a\u3069\u3092\u8abf\u3079\u308b\u5834\u5408\u306b\u975e\u5e38\u306b\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<p>\u3082\u3057array_keys\u95a2\u6570\u306e\u4f7f\u7528\u65b9\u6cd5\u3092\u5fd8\u308c\u3066\u3057\u307e\u3063\u305f\u3089\u3001\u3053\u306e\u8a18\u4e8b\u3092\u601d\u3044\u51fa\u3057\u3066\u304f\u3060\u3055\u3044\u306d\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\uff01\u30e9\u30a4\u30bf\u30fc\u306emuramatsu\u3067\u3059\u3002 PHP\u3067\u306f\u914d\u5217\u3092\u4f7f\u7528\u3057\u3066\u3055\u307e\u3056\u307e\u306a\u51e6\u7406\u304c\u53ef\u80fd\u3067\u3059\u3088\u306d\u3002 \u4eca\u56de\u306f\u914d\u5217\u306e\u51e6\u7406\u306e\u4e2d\u3067\u3082\u3001\u914d\u5217\u306e\u30ad\u30fc\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u3092\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002 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