{"id":9890,"date":"2025-09-25T18:11:59","date_gmt":"2025-09-25T09:11:59","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=9890"},"modified":"2025-10-17T18:16:10","modified_gmt":"2025-10-17T09:16:10","slug":"php-associative-array","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/php-associative-array\/","title":{"rendered":"\u3010PHP\u5165\u9580\u3011\u9023\u60f3\u914d\u5217\u306e\u4f7f\u3044\u65b9\u3092\u89e3\u8aac"},"content":{"rendered":"\n

\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u306f\u3001\u3044\u305a\u308c\u306e\u8a00\u8a9e\u306b\u3082\u8907\u6570\u306e\u30c7\u30fc\u30bf\u3092\uff11\u3064\u306b\u307e\u3068\u3081\u3066\u6271\u3046\u305f\u3081\u306e\u6a5f\u80fd\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002
PHP\u3082\u307e\u305f\u540c\u69d8\u306b\u3001\u914d\u5217\u3068\u547c\u3070\u308c\u308b\u8907\u6570\u306e\u5024\u3092\u307e\u3068\u3081\u3066\u6271\u3046\u305f\u3081\u306e\u30c7\u30fc\u30bf\u578b\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u914d\u5217\u306f\u3001\u4e2d\u306b\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u5024\u306e\u69cb\u9020\u3084\u3001\u305d\u308c\u305e\u308c\u306e\u5024\u3078\u306e\u30a2\u30af\u30bb\u30b9\u65b9\u6cd5\u306e\u9055\u3044\u306b\u3088\u3063\u3066\u3001\u3044\u304f\u3064\u304b\u306e\u7a2e\u985e\u306b\u5206\u985e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
\u305d\u306e\u3046\u3061\u306e\uff11\u3064\u304c\u3001\u9023\u60f3\u914d\u5217\u3068\u547c\u3070\u308c\u308b\u914d\u5217\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u4eca\u56de\u306e\u8a18\u4e8b\u3067\u306f\u3001PHP\u3067\u9023\u60f3\u914d\u5217\u3092\u6271\u3046\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3001\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

PHP\u306e\u9023\u60f3\u914d\u5217\u3068\u306f\uff1f<\/h2>\n\n\n\n

\u9023\u60f3\u914d\u5217\u306f\u3001\u914d\u5217\u306e\u4e00\u7a2e\u3067\u3059\u3002
\u901a\u5e38\u306e\u914d\u5217\u3068\u540c\u69d8\u306b\u3001\u8907\u6570\u306e\u30c7\u30fc\u30bf\u3092\uff11\u3064\u306b\u307e\u3068\u3081\u3066\u6271\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u5404\u8981\u7d20\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3067\u306f\u306a\u304f\u3001\u4efb\u610f\u306b\u6307\u5b9a\u53ef\u80fd\u306a\u30ad\u30fc\u306b\u3088\u3063\u3066\u884c\u3046\u306e\u304c\u5927\u304d\u306a\u7279\u5fb4\u306e\uff11\u3064\u3067\u3059\u3002<\/p>\n\n\n\n

\u305d\u306e\u4ed6\u306e\u8a00\u8a9e\u3067\u306f\u3001\u8f9e\u66f8\u578b\u306a\u3069\u3068\u547c\u3070\u308c\u308b\u914d\u5217\u3068\u306f\u7570\u306a\u308b\u578b\u306e\u3053\u3068\u3092\u6307\u3059\u5834\u5408\u304c\u591a\u3044\u9023\u60f3\u914d\u5217\u3067\u3059\u304c\u3001PHP\u306b\u304a\u3044\u3066\u306f\u3001\u901a\u5e38\u306e\u914d\u5217\u3068\u9023\u60f3\u914d\u5217\u306e\u3069\u3061\u3089\u3082\u540c\u3058\u578b\u3068\u3057\u3066\u6271\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

\u305d\u306e\u305f\u3081\u3001\uff11\u3064\u306e\u914d\u5217\u306e\u4e2d\u3067\u3082\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u3088\u3063\u3066\u7ba1\u7406\u3055\u308c\u308b\u8981\u7d20\u3068\u30ad\u30fc\u306b\u3088\u3063\u3066\u7ba1\u7406\u3055\u308c\u308b\u8981\u7d20\u3092\u6df7\u5728\u3055\u305b\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n

$array = array('apple'=>'\u308a\u3093\u3054', '\u307f\u304b\u3093', 'peach'=>'\u3082\u3082');<\/code><\/pre><\/div>\n\n\n\n
\u9023\u60f3\u914d\u5217\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n
\u9023\u60f3\u914d\u5217\u306e\u5177\u4f53\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3001\u9806\u306b\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u9023\u60f3\u914d\u5217\u3092\u5ba3\u8a00\u3059\u308b<\/h3>\n\n\n\n
\u5ba3\u8a00\u6642\u306b\u8981\u7d20\u306f\u683c\u7d0d\u305b\u305a\u7a7a\u306e\u914d\u5217\u3092\u4f5c\u6210\u3059\u308b\u5834\u5408\u306f\u3001\u901a\u5e38\u306e\u914d\u5217\u3068\u540c\u69d8\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n\n
$\u914d\u5217\u540d = array();\n\/\/ \u3082\u3057\u304f\u306f\n$\u914d\u5217\u540d = [];<\/code><\/pre><\/div>\n\n\n\n
\u5ba3\u8a00\u3068\u540c\u6642\u306b\u8981\u7d20\u3092\u683c\u7d0d\uff08\u521d\u671f\u5316\uff09\u3059\u308b\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5ba3\u8a00\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n\n
$\u914d\u5217\u540d = array(\u30ad\u30fc1=>\u50241, \u30ad\u30fc2=>\u50242, \u2026);\n\/\/ \u3082\u3057\u304f\u306f\n$\u914d\u5217\u540d = [\u30ad\u30fc1=>\u50241, \u30ad\u30fc2=>\u50242, \u2026];<\/code><\/pre><\/div>\n\n\n\n
\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u4f7f\u3044\u5206\u3051\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
key\u3092\u6307\u5b9a\u3057\u3066\u5024\u3092\u53d6\u5f97\u3059\u308b<\/h3>\n\n\n\n
\u9023\u60f3\u914d\u5217\u306e\u4f5c\u6210\u3068\u8981\u7d20\u306e\u683c\u7d0d\u304c\u5b8c\u4e86\u3057\u305f\u3089\u3001\u30ad\u30fc\u3092\u6307\u5b9a\u3057\u3066\u5024\u3092\u53d6\u308a\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u30ad\u30fc\u3092\u6307\u5b9a\u3059\u308b\u969b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b [] \u5185\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n\n
$\u914d\u5217\u540d[\u30ad\u30fc];<\/code><\/pre><\/div>\n\n\n\n
\u4ee5\u4e0b\u306e\u4f8b\u3067\u3001\u5b9f\u969b\u306e\u52d5\u304d\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
$fruitsArray = [\n    'apple'=>'\u308a\u3093\u3054', \n    'grape'=>'\u3076\u3069\u3046', \n    'peach'=>'\u3082\u3082'];\n\necho $fruitsArray['apple']."\\n";\necho $fruitsArray['grape']."\\n";\necho $fruitsArray['peach']."\\n";<\/code><\/pre><\/div>\n\n\n\n
\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n
\u308a\u3093\u3054\n\u3076\u3069\u3046\n\u3082\u3082<\/code><\/pre><\/div>\n\n\n\n
\u305d\u308c\u305e\u308c\u306e\u30ad\u30fc\u306b\u5bfe\u5fdc\u3059\u308b\u5024\u304c\u8868\u793a\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002
\u3053\u306e\u3088\u3046\u306b\u3001\u53d6\u308a\u51fa\u3057\u305f\u3044\u8981\u7d20\u306e\u30ad\u30fc\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u30a2\u30af\u30bb\u30b9\u304c\u53ef\u80fd\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
foreach\u30eb\u30fc\u30d7\u3067\u9023\u60f3\u914d\u5217\u306ekey\u3068\u5024\u3092\u51fa\u529b\u3059\u308b<\/h3>\n\n\n\n
\u914d\u5217\u5185\u306e\u8981\u7d20\u306b\u5bfe\u3057\u3066\u51e6\u7406\u3092\u884c\u3046\u969b\u306b\u3001\u8981\u7d20\uff11\u3064\uff11\u3064\u306b\u5bfe\u3057\u3066\u51e6\u7406\u3092\u5225\u3005\u306b\u8a18\u8ff0\u3059\u308b\u65b9\u6cd5\u3067\u306f\u3001
\u30b3\u30fc\u30c9\u304c\u81a8\u5927\u306a\u91cf\u3068\u306a\u3063\u3066\u3057\u307e\u3046\u30b1\u30fc\u30b9\u304c\u591a\u3005\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u5168\u3066\u306e\u8981\u7d20\u306b\u5bfe\u3057\u3066\u540c\u3058\u3088\u3046\u306a\u51e6\u7406\u3092\u884c\u3046\u5834\u5408\u306f\u3001\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u6d3b\u7528\u3057\u3066\u30b3\u30fc\u30c9\u3092\u7c21\u7d20\u5316\u3055\u305b\u307e\u3057\u3087\u3046\u3002
foreach\u6587\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u914d\u5217\u5185\u306e\u5404\u8981\u7d20\u306b\u9806\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
$fruitsArray = [\n    'apple'=>'\u308a\u3093\u3054', \n    'grape'=>'\u3076\u3069\u3046', \n    'peach'=>'\u3082\u3082'\n];\n\nforeach($fruitsArray as $key=>$value){\n    echo $key.'\uff1a'.$value."\\n";\n}<\/code><\/pre><\/div>\n\n\n\n
\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n
apple\uff1a\u308a\u3093\u3054\ngrape\uff1a\u3076\u3069\u3046\npeach\uff1a\u3082\u3082<\/code><\/pre><\/div>\n\n\n\n
foreach\u6587\u3067\u9023\u60f3\u914d\u5217\u3092\u5bfe\u8c61\u306b\u3059\u308b\u5834\u5408\u306f\u3001\u5909\u6570\u306e\u6307\u5b9a\u6642\u306b \u300c$\u30ad\u30fc\u306e\u5909\u6570\u540d=>$\u5024\u306e\u5909\u6570\u540d\u300d \u3068\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u3001\u8981\u7d20\u306e\u5024\u3060\u3051\u3067\u306a\u304f\u30ad\u30fc\u3082\u540c\u6642\u306b\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u306a\u304a\u3001\u5909\u6570\u304c\uff11\u3064\u306e\u307f\u306e\u5834\u5408\u306f\u3001\u901a\u5e38\u306e\u914d\u5217\u3068\u540c\u69d8\u306b\u5024\u3060\u3051\u304c\u683c\u7d0d\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
\u9023\u60f3\u914d\u5217\u306ekey\u3092\u6307\u5b9a\u3057\u3066\u5024\u3092\u4e0a\u66f8\u304d\u3059\u308b<\/h3>\n\n\n\n
\u9023\u60f3\u914d\u5217\u306e\u8981\u7d20\u306e\u5024\u306f\u3001\u5f8c\u304b\u3089\u5225\u306e\u5024\u306b\u4e0a\u66f8\u304d\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u5024\u306e\u4e0a\u66f8\u304d\u3092\u884c\u3046\u969b\u306f\u3001\u5909\u66f4\u3057\u305f\u3044\u8981\u7d20\u306e\u30ad\u30fc\u3092\u6307\u5b9a\u3057\u3001\u5909\u6570\u306b\u5024\u3092\u4ee3\u5165\u3059\u308b\u3068\u304d\u3068\u540c\u3058\u3088\u3046\u306a\u5f62\u5f0f\u3067\u4e0a\u66f8\u304d\u3057\u305f\u3044\u5024\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
$fruitsArray = ['grape'=>'\u3076\u3069\u3046'];\n\necho '\u5909\u66f4\u524d\uff1a'.$fruitsArray['grape']."\\n";\n\n$fruitsArray['grape'] = '\u30d6\u30c9\u30a6';\n\necho '\u5909\u66f4\u5f8c\uff1a'.$fruitsArray['grape']."\\n";<\/code><\/pre><\/div>\n\n\n\n
\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n
\u5909\u66f4\u524d\uff1a\u3076\u3069\u3046\n\u5909\u66f4\u5f8c\uff1a\u30d6\u30c9\u30a6<\/code><\/pre><\/div>\n\n\n\n
\u7121\u4e8b\u306b\u5024\u304c\u5909\u66f4\u3055\u308c\u307e\u3057\u305f\u306d\u3002
\u3053\u306e\u3088\u3046\u306b\u3001\u9023\u60f3\u914d\u5217\u306e\u8981\u7d20\u306f\u5f8c\u304b\u3089\u5024\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n
\u9023\u60f3\u914d\u5217\u306ekey\u3092\u6307\u5b9a\u3057\u3066\u5024\u3092\u8ffd\u52a0\u3059\u308b<\/h3>\n\n\n\n
\u9023\u60f3\u914d\u5217\u5185\u306b\u307e\u3060\u5b58\u5728\u3057\u306a\u3044\u30ad\u30fc\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u65b0\u3057\u304f\u5024\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u4ee5\u4e0b\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
$fruitsArray = [\n    'apple'=>'\u308a\u3093\u3054',\n    'grape'=>'\u3076\u3069\u3046'\n];\n\necho '\u5909\u66f4\u524d\uff1a';\nprint_r($fruitsArray);\n\n$fruitsArray['peach'] = '\u3082\u3082';\n\necho "\\n".'\u5909\u66f4\u5f8c\uff1a';\nprint_r($fruitsArray);<\/code><\/pre><\/div>\n\n\n\n
\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n
\u5909\u66f4\u524d\uff1aArray\n(\n    [apple] => \u308a\u3093\u3054\n    [grape] => \u3076\u3069\u3046\n)\n\n\u5909\u66f4\u5f8c\uff1aArray\n(\n    [apple] => \u308a\u3093\u3054\n    [grape] => \u3076\u3069\u3046\n    [peach] => \u3082\u3082\n)<\/code><\/pre><\/div>\n\n\n\n
\u5bfe\u8c61\u306e\u914d\u5217\u5185\u306b\u5b58\u5728\u3057\u3066\u3044\u306a\u304b\u3063\u305f \u300cpeach\u300d \u306e\u6587\u5b57\u5217\u3092\u30ad\u30fc\u306b\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u65b0\u3057\u304f\u5024\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
\u306a\u304a\u3001\u30ad\u30fc\u3092\u6307\u5b9a\u3059\u308b\u969b\u306b\u9593\u9055\u3048\u3066\u65e2\u5b58\u306e\u3082\u306e\u3068\u540c\u3058\u30ad\u30fc\u3092\u6307\u5b9a\u3057\u3066\u3057\u307e\u3046\u3068\u3001\u5024\u304c\u4e0a\u66f8\u304d\u3055\u308c\u3066\u3057\u307e\u3046\u305f\u3081\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n
\u9023\u60f3\u914d\u5217\u306ekey\u304c\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u308b<\/h3>\n\n\n\n
\u4e0a\u8ff0\u3057\u305f\u3088\u3046\u306b\u3001\u9023\u60f3\u914d\u5217\u5185\u306e\u8981\u7d20\u306e\u5024\u3092\u4e0a\u66f8\u304d\u3059\u308b\u5834\u5408\u3084\u3001\u65b0\u3057\u3044\u5024\u3092\u8ffd\u52a0\u3059\u308b\u5834\u5408\u306b\u3001\u30ad\u30fc\u306e\u6307\u5b9a\u3092\u9593\u9055\u3048\u308b\u3068\u601d\u308f\u306c\u4e0d\u5177\u5408\u3092\u62db\u304f\u539f\u56e0\u3068\u306a\u308a\u304b\u306d\u307e\u305b\u3093\u3002<\/p>\n\n\n\n
\u305d\u306e\u305f\u3081\u3001\u4e0a\u66f8\u304d\u3084\u8ffd\u52a0\u306e\u51e6\u7406\u3092\u884c\u3046\u969b\u306f\u3001\u4e8b\u524d\u306b\u5bfe\u8c61\u3068\u3059\u308b\u30ad\u30fc\u304c\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u9023\u60f3\u914d\u5217\u5185\u306e\u30ad\u30fc\u306e\u6709\u7121\u3092\u78ba\u8a8d\u3067\u304d\u308b\u65b9\u6cd5\u306f\u3001\u4ee5\u4e0b\u306e\uff12\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n
    \n
  • isset\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b<\/li>\n\n\n\n
  • array_key_exists\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b<\/li>\n<\/ul>\n\n\n\n
    isset\u95a2\u6570\u306f\u3001\u53b3\u5bc6\u306b\u306f\u30ad\u30fc\u306e\u6709\u7121\u3092\u78ba\u8a8d\u3059\u308b\u95a2\u6570\u3067\u306f\u306a\u304f\u3001\u6307\u5b9a\u3057\u305f\u5909\u6570\u306b\u5024\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306e\u95a2\u6570\u3067\u3059\u304c\u3001\u5bfe\u8c61\u306e\u8981\u7d20\u306e\u30ad\u30fc\u304c\u672a\u4f7f\u7528\u306e\u5834\u5408\u306b\u3082\u771f\u507d\u5024\u3092\u8fd4\u3059\u305f\u3081\u3001\u914d\u5217\u5185\u306e\u30ad\u30fc\u306e\u6709\u7121\u3092\u78ba\u8a8d\u3059\u308b\u65b9\u6cd5\u3068\u3057\u3066\u3082\u6d3b\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
    \u305d\u308c\u305e\u308c\u306e\u95a2\u6570\u306e\u4e3b\u306a\u9055\u3044\u306f\u3001 \u8981\u7d20\u306e\u5024\u304c null\u306e\u5834\u5408\u3092\u8a31\u5bb9\u3059\u308b\u304b\u5426\u304b\u306b\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
    isset\u95a2\u6570\u306f\u3001\u5bfe\u8c61\u306e\u30ad\u30fc\u304c\u672a\u4f7f\u7528\u306e\u5834\u5408\u3060\u3051\u3067\u306a\u304f\u3001\u5bfe\u5fdc\u3059\u308b\u5024\u304c null\u306e\u5834\u5408\u306b\u3082 false\u3092\u8fd4\u3057\u307e\u3059\u3002
    \u4e00\u65b9\u3001array_key_exists\u95a2\u6570\u306e\u5834\u5408\u306f\u3001\u5bfe\u8c61\u306e\u30ad\u30fc\u304c\u672a\u4f7f\u7528\u306e\u6642\u306b\u3060\u3051 false\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
    \u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3001\u52d5\u304d\u306e\u9055\u3044\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
    \u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
    $fruitsArray = [\n    'apple'=>'\u308a\u3093\u3054',\n    'grape'=> null\n];\n\nvar_dump(isset($fruitsArray['grape']));\nvar_dump(array_key_exists('grape', $fruitsArray));<\/code><\/pre><\/div>\n\n\n\n
    \u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n
    bool(false)\nbool(true)<\/code><\/pre><\/div>\n\n\n\n
    \u5024\u304c null\u3068\u306a\u3063\u3066\u3044\u308b\u8981\u7d20\u306e\u30ad\u30fc\u3092\u5bfe\u8c61\u3068\u3057\u305f\u969b\u306b\u3001\u305d\u308c\u305e\u308c\u306e\u95a2\u6570\u3067\u7d50\u679c\u304c\u7570\u306a\u3063\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n
    \u30ad\u30fc\u304c\u5b58\u5728\u3059\u308b\u304b\u5426\u304b\u3060\u3051\u3092\u6b63\u78ba\u306b\u78ba\u8a8d\u3057\u305f\u3044\u5834\u5408\u306f array_key_exists\u95a2\u6570\u3001\u30ad\u30fc\u306b\u5bfe\u5fdc\u3059\u308b\u5024\u304c null \u3067\u306a\u3044\u3053\u3068\u3092\u5408\u308f\u305b\u3066\u78ba\u8a8d\u3057\u305f\u3044\u5834\u5408\u306f isset\u95a2\u6570\u3092\u6d3b\u7528\u3059\u308b\u3068\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
    \u9023\u60f3\u914d\u5217\u306e\u30ad\u30fc\u306e\u547d\u540d\u306b\u95a2\u3059\u308b\u6ce8\u610f\u4e8b\u9805<\/h2>\n\n\n\n
    \u9023\u60f3\u914d\u5217\u306e\u30ad\u30fc\u3092\u547d\u540d\u3059\u308b\u969b\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u30dd\u30a4\u30f3\u30c8\u3084\u6ce8\u610f\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
    PHP\u3067\u306f\u3001\u95a2\u6570\u540d\u3084\u30af\u30e9\u30b9\u540d\u306a\u3069\u306e\u4e00\u90e8\u306e\u6a5f\u80fd\u306b\u304a\u3044\u3066\u3001\u5927\u6587\u5b57\u3068\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u306a\u3044\u3068\u3044\u3046\u6027\u8cea\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u9023\u60f3\u914d\u5217\u306e\u30ad\u30fc\u306f\u3053\u308c\u306b\u306f\u8a72\u5f53\u3057\u307e\u305b\u3093\u3002<\/p>\n\n\n\n
    \u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
    $fruitsArray = [\n    'apple'=>'\u308a\u3093\u3054',\n    'APPLE'=>'\u30ea\u30f3\u30b4'\n];\n\necho $fruitsArray['apple']."\\n";\necho $fruitsArray['APPLE']."\\n";<\/code><\/pre><\/div>\n\n\n\n
    \u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n
    \u308a\u3093\u3054\n\u30ea\u30f3\u30b4<\/code><\/pre><\/div>\n\n\n\n
    \u540c\u3058\u5358\u8a9e\u3067\u3082\u3001\u5927\u5c0f\u306b\u3088\u3063\u3066\u5225\u306e\u30ad\u30fc\u3068\u3057\u3066\u533a\u5225\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u305d\u306e\u4e00\u65b9\u3067\u5927\u6587\u5b57\u3068\u5c0f\u6587\u5b57\u306e\u9055\u3044\u304c\u52d5\u4f5c\u306b\u5f71\u97ff\u3059\u308b\u5834\u5408\u3082\u3042\u308a\u5f97\u308b\u305f\u3081\u3001\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n
    \u307e\u305f\u3001\u30ad\u30fc\u306e\u547d\u540d\u306b\u306f\u30a2\u30eb\u30d5\u30a1\u30d9\u30c3\u30c8\u3060\u3051\u3067\u306a\u304f\u3001\u30de\u30eb\u30c1\u30d0\u30a4\u30c8\u6587\u5b57\u3068\u547c\u3070\u308c\u308b\u65e5\u672c\u8a9e\u306a\u3069\u306e\u6587\u5b57\u3084\u3001\u6570\u5024\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
    \u305f\u3060\u3057\u3001\u57fa\u672c\u7684\u306b\u30de\u30eb\u30c1\u30d0\u30a4\u30c8\u6587\u5b57\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u308b\u5927\u304d\u306a\u554f\u984c\u306f\u306a\u3044\u3082\u306e\u306e\u3001\u4f7f\u7528\u74b0\u5883\u4e0b\u306e\u6587\u5b57\u30b3\u30fc\u30c9\u3068\u306e\u517c\u306d\u5408\u3044\u306b\u3088\u3063\u3066\u306f\u601d\u308f\u306c\u4e0d\u5177\u5408\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u3082\u30bc\u30ed\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002
    \u305d\u306e\u305f\u3081\u3001\u7279\u5225\u306a\u7406\u7531\u304c\u306a\u3044\u9650\u308a\u306f\u3001\u30ad\u30fc\u306e\u547d\u540d\u306b\u306f\u30a2\u30eb\u30d5\u30a1\u30d9\u30c3\u30c8\u304b\u6570\u5024\u306e\u307f\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
    \u306a\u304a\u3001\u30ad\u30fc\u306b\u6570\u5024\u3092\u4f7f\u7528\u3059\u308b\u30b1\u30fc\u30b9\u3067\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3067\u306e\u7ba1\u7406\u3092\u884c\u3046\u8981\u7d20\u3068\u6df7\u5408\u3057\u3066\u3044\u308b\u914d\u5217\u306e\u5834\u5408\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u756a\u53f7\u304c\u8981\u7d20\u306e\u683c\u7d0d\u9806\u3068\u306f\u7570\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
    \u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
    $fruitsArray = [\n    '\u308a\u3093\u3054',\n    5=>'\u3076\u3069\u3046',\n    '\u3082\u3082'\n];\n\nprint_r($fruitsArray);<\/code><\/pre><\/div>\n\n\n\n
    \u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n
    Array\n(\n    [0] => \u308a\u3093\u3054\n    [5] => \u3076\u3069\u3046\n    [6] => \u3082\u3082\n)<\/code><\/pre><\/div>\n\n\n\n
    \u901a\u5e38\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u307f\u3067\u7ba1\u7406\u3059\u308b\u914d\u5217\u306e\u5834\u5408\u306f\uff10\u304b\u3089\u9806\u306b\u756a\u53f7\u304c\u5272\u308a\u632f\u3089\u308c\u307e\u3059\u304c\u3001\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u9014\u4e2d\u3067\u6570\u5024\u3092\u4f7f\u7528\u3057\u305f\u30ad\u30fc\u306e\u6307\u5b9a\u304c\u631f\u307e\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u305d\u306e\u5f8c\u306b\u7d9a\u304f\u8981\u7d20\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u76f4\u524d\u306e\u30ad\u30fc\u306e\u6570\u5024\u306b\u5f71\u97ff\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
    \u3053\u306e\u3088\u3046\u306b\u3001\u30ad\u30fc\u306e\u6307\u5b9a\u306b\u3088\u3063\u3066\u4ed6\u306e\u8981\u7d20\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u5f71\u97ff\u304c\u51fa\u308b\u5834\u5408\u3082\u3042\u308b\u305f\u3081\u3001\u6307\u5b9a\u306e\u969b\u306b\u306f\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n
    \u307e\u3068\u3081<\/h2>\n\n\n\n
    \u3044\u304b\u304c\u3067\u3057\u305f\u304b\uff1f\u4eca\u56de\u306f\u3001PHP\u3067\u9023\u60f3\u914d\u5217\u3092\u6271\u3046\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n
    \u9023\u60f3\u914d\u5217\u3092\u542b\u3080\u305d\u308c\u305e\u308c\u306e\u914d\u5217\u306f\u3001PHP\u306b\u9650\u3089\u305a\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u3059\u308b\u4e0a\u3067\u5207\u3063\u3066\u3082\u5207\u308a\u96e2\u305b\u306a\u3044\u6a5f\u80fd\u306e\uff11\u3064\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002
    \u5b9f\u969b\u306e\u958b\u767a\u306b\u304a\u3044\u3066\u3082\u3001\u304a\u306e\u305a\u3068\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u6a5f\u80fd\u3067\u3042\u308b\u305f\u3081\u3001\u4eca\u56de\u306e\u8a18\u4e8b\u3067\u89e3\u8aac\u3057\u305f\u4f7f\u3044\u65b9\u306e\u57fa\u790e\u3092\u3057\u3063\u304b\u308a\u3068\u62bc\u3055\u3048\u3001\u6d3b\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
    PHP\u306e\u52c9\u5f37\u65b9\u6cd5\u306f\uff1f<\/h2>\n\n\n
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