{"id":22049,"date":"2017-04-25T21:39:17","date_gmt":"2017-04-25T12:39:17","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=22049"},"modified":"2024-05-06T11:41:50","modified_gmt":"2024-05-06T02:41:50","slug":"%e3%80%90php%e5%85%a5%e9%96%80%e3%80%91%e9%85%8d%e5%88%97%e3%81%ae%e8%a6%81%e7%b4%a0%e3%81%8c%e7%a9%ba%e3%81%8b%e5%88%a4%e5%ae%9a%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/22049","title":{"rendered":"empty\u3067\u914d\u5217\u304c\u7a7a\u304b\u30c1\u30a7\u30c3\u30af\u3057\u3088\u3046!isset\u3068\u306e\u9055\u3044\u3082\u3042\u308b\u3088\uff5ePHP\u5165\u9580\uff5e"},"content":{"rendered":"<p>\u914d\u5217\u306e\u4e2d\u8eab\u304c\u7a7a\u304b\u3069\u3046\u304b\u5224\u65ad\u3059\u308b\u3068\u304d\u306b\u3069\u3046\u3059\u308c\u3070\u3088\u3044\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>\u307e\u305f\u3001\u300cempty\u95a2\u6570\u3084isset\u95a2\u6570\u3068\u3044\u3063\u305f\u4f3c\u305f\u3088\u3046\u306a\u95a2\u6570\u306e\u4f7f\u3044\u5206\u3051\u304c\u308f\u304b\u3089\u306a\u3044\u3001\u3088\u304f\u5fd8\u308c\u308b\u300d\u306a\u3069\u60a9\u307f\u3092\u62b1\u3048\u3066\u3044\u308b\u65b9\u306f\u3053\u306e\u305c\u3072\u8a18\u4e8b\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\uff01<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001<br \/>\n<div class=\"box01\"><\/p>\n<ul>\n<li><b>empty\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u3001\u914d\u5217\u304c\u7a7a\u304b\u5224\u5b9a\u3059\u308b\u65b9\u6cd5<\/b><\/li>\n<li><b>empty\u95a2\u6570\u3068isset\u95a2\u6570\u306e\u9055\u3044<\/b><\/li>\n<\/ul>\n<p><\/div><br \/>\n\u3068\u3044\u3046\u57fa\u672c\u7684\u306a\u5185\u5bb9\u306e\u89e3\u8aac\u3068<\/p>\n<div class=\"box01\">\n<ul>\n<li><b>empty\u30fbisset\u30fbis_null\u306e\u771f\u507d\u5024\u7d50\u679c\u4e00\u89a7<\/b><\/li>\n<\/ul>\n<\/div>\n<p>\u3068\u305d\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u8a18\u8ff0\u3057\u3066\u3044\u304d\u307e\u3059\u306e\u3067\u3001\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u4eca\u56de\u306f\u914d\u5217\u3092\u4f7f\u3063\u3066\u8981\u7d20\u3092\u5224\u5b9a\u3057\u3066\u3044\u304f\u65b9\u6cd5\u3082\u7d39\u4ecb\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u3082\u3057\u914d\u5217\u306b\u3064\u3044\u3066\u307e\u3060\u3088\u304f\u308f\u304b\u3089\u306a\u3044\u306a\u3001\u3068\u3044\u3046\u65b9\u306f\u307e\u305a\u306f\u4e0b\u8a18\u8a18\u4e8b\u304b\u3089\u8aad\u3093\u3067\u307f\u3066\u304f\u3060\u3055\u3044\u306d\u3002<\/p>\n<p>\u914d\u5217\u306b\u5024\u3092\u8ffd\u52a0\u3059\u308b\u65b9\u6cd5\u3084\u3001\u914d\u5217\u3092\u30b3\u30d4\u30fc\u3059\u308b\u65b9\u6cd5\u306a\u3069\u3001\u914d\u5217\u306b\u95a2\u3059\u308b\u3055\u307e\u3056\u307e\u306a\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/25031\" 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\/image-12-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010PHP\u5165\u9580\u3011\u914d\u5217\u306e\u4f7f\u3044\u65b9\u7dcf\u307e\u3068\u3081<\/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>empty\u95a2\u6570\u3068\u306f<\/h2>\n<p>empty\u95a2\u6570\u3068\u306f\u3001\u82f1\u8a9e\u306eempty\u304c\u300c\u7a7a\u300d\u306e\u610f\u5473\u3092\u3057\u3066\u3044\u308b\u3088\u3046\u306b\u3001\u914d\u5217\u3084\u5909\u6570\u304c\u7a7a\u3067\u3042\u308b\u304b\u5224\u5b9a<b>\u3057\u307e\u3059\u3002<\/b><\/p>\n<h3>\u57fa\u672c\u69cb\u6587<\/h3>\n<p>empty\u95a2\u6570\u306f\u3001\u5f15\u6570\u306b\u306f\u914d\u5217\u3001\u5909\u6570\u3001\u5f0f\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"decode:true \">empty($\u5909\u6570\u540d\u307e\u305f\u306f\u914d\u5217\u540d\u3001\u5f0f)<\/pre>\n<p>\u8fd4\u308a\u5024\uff1a<br \/>\n\u5f15\u6570\u306b\u6307\u5b9a\u3057\u305f\u5909\u6570\u304c\u5b58\u5728\u3057\u3001\u305d\u306e\u5024\u304c\u7a7a\u30840\u3067\u306a\u3051\u308c\u3070<b>FALSE<\/b>\u3092\u8fd4\u3057\u3001\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u306f<b>TRUE<\/b>\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306e\u5024\u306f\u7a7a(TRUE)\u3068\u307f\u306a\u3055\u308c\u308b\u306e\u3067\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n<table id=\"tablepress-433\" class=\"tablepress tablepress-id-433\">\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-1\">\n\t<td class=\"column-1\">\u201d\u201d <br \/>\n<\/td><td class=\"column-2\">\u7a7a\u6587\u5b57\u5217<\/td>\n<\/tr>\n<tr class=\"row-2\">\n\t<td class=\"column-1\">0<\/td><td class=\"column-2\">\u6574\u6570 \u306e 0<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">0.0<\/td><td class=\"column-2\">\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e 0<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">\u201d0\u2033<\/td><td class=\"column-2\">\u6587\u5b57\u5217 \u306e 0<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">NULL<\/td><td class=\"column-2\"><\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">FALSE<\/td><td class=\"column-2\"><\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">array() <\/td><td class=\"column-2\">\u7a7a\u306e\u914d\u5217<\/td>\n<\/tr>\n<tr class=\"row-8\">\n\t<td class=\"column-1\">$var;<\/td><td class=\"column-2\">\u5909\u6570\u304c\u5ba3\u8a00\u3055\u308c\u3066\u3044\u308b\u304c\u3001\u5024\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-433 from cache -->\n<h3>empty\u95a2\u6570\u306e\u4f7f\u3044\u65b9<\/h3>\n<p>empty\u95a2\u6570\u306f\u4e3b\u306bif\u6587\u3068\u4e00\u7dd2\u306b\u4f7f\u308f\u308c\u3082\u3057$\u5909\u6570\u307e\u305f\u306f$\u914d\u5217\u304c<b>empty\u306e\u6642\u51e6\u7406\u3059\u308b<\/b>\u3068\u3044\u3046\u3088\u3046\u306b\u66f8\u3044\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306bempty\u95a2\u6570\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"decode:true \">&lt;?php\r\n\r\n$var = 0;\r\n\/\/\u5909\u6570\uff1a0\u306a\u306e\u3067TRUE\r\nif (empty($var)){\r\n  echo '$var\u306f0\u3067\u3059\u3002&lt;br&gt;';\r\n}\r\n\r\n$str = '';\r\n\/\/\u5909\u6570\uff1a\u7a7a\u306a\u306e\u3067TRUE\r\nif (empty($str)){\r\n  echo '$str\u306f\u7a7a\u3067\u3059\u3002';\r\n}\r\n\r\n$array = [];\r\n\/\/\u914d\u5217\uff1a\u7a7a\u306a\u306e\u3067TRUE\r\nif (empty($fruits)){\r\n  echo '$array\u306f\u7a7a\u3067\u3059\u3002&lt;br&gt;';\r\n}\r\n\r\n?&gt;<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">$array\u306f\u7a7a\u3067\u3059\u3002\r\n$var\u306f0\u3067\u3059\u3002\r\n$str\u306f\u7a7a\u3067\u3059\u3002<\/pre>\n<p>$\u5909\u6570\u307e\u305f\u306f$\u914d\u5217\u3092\u30bb\u30c3\u30c8\u3057\u307e\u3059\u3002if\u6587\u3092\u4f7f\u3063\u3066\u3082\u3057$\u5909\u6570\u307e\u305f\u306f$\u914d\u5217\u304cempty\u306e\u5834\u5408echo\u3067\u51fa\u529b\u3059\u308b\u3001\u3068\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<p>empty\u306e\u771f\u507d\u5024\u304cTRUE\u306e\u5834\u5408\u306becho\u304c\u51e6\u7406\u3055\u308c\u307e\u3059\u3002<\/p>\n<h2>empty\u95a2\u6570\u3068\u4f3c\u3066\u975e\u306a\u308b\u95a2\u6570isset<\/h2>\n<p>empty\u95a2\u6570\u3067\u306f\u3001\u914d\u5217\u306e\u8981\u7d20\u304c\u7a7a\u30840\u3001NULL\u306e\u5834\u5408\u306bTRUE\u3068\u306a\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>\u3053\u306eempty\u95a2\u6570\u3068\u4f3c\u305f\u3088\u3046\u306a\u3001\u914d\u5217\u306e\u8981\u7d20\u306e\u5024\u3092\u78ba\u8a8d\u3059\u308b\u95a2\u6570\u306f\u4ed6\u306b\u3082\u3044\u304f\u3064\u304b\u3042\u308a\u3001\u305d\u306e\u4e2d\u3067\u3088\u304f\u6bd4\u8f03\u3055\u308c\u308bisset\u95a2\u6570\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306eempty\u3068isset\u306e2\u3064\u3092\u6bd4\u3079\u308b\u3068\u6df7\u4e71\u3057\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u304c\u3001\u5b9f\u969b\u3069\u306e\u3088\u3046\u306a\u9055\u3044\u304c\u3042\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<h3>isset\u95a2\u6570\u3068\u306f\u30fbempty\u95a2\u6570\u3068\u306e\u9055\u3044<\/h3>\n<p>isset\u95a2\u6570\u306f<b>\u5909\u6570\u306b\u5024\u304c\u30bb\u30c3\u30c8\u3055\u308c\u3066\u304a\u308a\u3001\u304b\u3064NULL\u3067\u306a\u3044<\/b>\u3053\u3068\u3092\u5224\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p>\u8fd4\u308a\u5024\uff1a<br \/>\n\u5f15\u6570\u306b\u306f\u914d\u5217\u306e\u5024\u307e\u305f\u306f\u5909\u6570\u3092\u6307\u5b9a\u3057\u3001NULL\u306e\u5834\u5408\u306fbool(\u771f\u507d\u5024)\u578b\u306eFALSE\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u7c21\u5358\u306b\u8a00\u3046\u3068\u3001NULL\u4ee5\u5916\u306fTRUE\u3092\u8fd4\u3059\u306e\u3067\u3001\u914d\u5217\u306e\u8981\u7d20\u304cNULL\u304b\u305d\u3046\u3067\u306a\u3044\u304b\u3092\u78ba\u8a8d\u3067\u304d\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u57fa\u672c\u69cb\u6587\u306e\u66f8\u304d\u65b9\u306f\u3001empty\u95a2\u6570\u3068\u540c\u3058\u3088\u3046\u306a\u30b3\u30fc\u30c9\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"decode:true \">isset($\u5909\u6570 [, $\u5225\u306e\u5909\u6570\u2026])<\/pre>\n<p>empty\u95a2\u6570\u3068isset\u95a2\u6570\u3067\u306f\u3001empty\u95a2\u6570\u306f$\u5909\u6570\u307e\u305f\u306f$\u914d\u5217\u304cnull\u306e\u6642\u306fTRUE(\u7a7a)<\/p>\n<p>\u3068\u306a\u308b\u306e\u306b\u5bfe\u3057\u3001isset\u95a2\u6570\u306f$\u5909\u6570\u304cnull\u306e\u6642\u306fFALSE(null)\u3068\u5224\u65ad\u3092\u3057\u3066\u304f\u308c\u308b\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>isset\u95a2\u6570\u306e\u4f7f\u3044\u65b9\u30fbempty\u95a2\u6570\u3068\u306e\u6bd4\u8f03<\/h3>\n<p>isset\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u3001\u5909\u6570\u304cNULL\u3067\u306a\u3044\u3053\u3068\u3092\u5224\u5b9a\u3059\u308b\u51e6\u7406\u3092\u4ee5\u4e0b\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<p>foreach\u6587\u3092\u4f7f\u3063\u3066\u30eb\u30fc\u30d7\u3057\u3066\u8981\u7d201\u30641\u3064\u3092\u53d6\u308a\u51fa\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"decode:true \">&lt;?php\r\n\r\n$fruits = ['apple', 'orange', NULL, 'banana', 'pineapple'];\r\n\r\nforeach($fruits as $value){\r\n  \/\/isset\u95a2\u6570\u306e\u5834\u5408NULL\u306e\u5834\u5408\u306fFALSE\u306b\u306a\u308a\u307e\u3059\r\n  if (isset($value)){\r\n    \/\/TRUE\u306e\u5834\u5408\u306b\u4e0b\u8a18\u306e\u5185\u5bb9\u3092\u51fa\u529b\u3055\u305b\u307e\u3059\r\n    echo 'NULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093';\r\n  }else{\r\n    \/\/FALSE\u306e\u6642\u306b\u4e0b\u8a18\u306e\u5185\u5bb9\u3092\u51fa\u529b\u3055\u305b\u307e\u3059\r\n    echo 'NULL\u3067\u3059';\r\n  }\r\n  echo '&lt;br&gt;';\r\n}\r\n\r\n?&gt;<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">NULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093\r\nNULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093\r\nNULL\u3067\u3059\r\nNULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093\r\nNULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093<\/pre>\n<p>\u914d\u5217$fruits\u306e\u4e2d\u304c\u7a7a\u304bforeach\u6587\u3067\u30eb\u30fc\u30d7\u3057\u3066\u8981\u7d201\u3064\u305a\u3064\u5224\u5b9a\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p><b>\u914d\u5217\u306e\u4e2d\u306bNULL\u306e\u8981\u7d20\u304c\u5b58\u5728\u3059\u308b\u304b<\/b>\u8abf\u3079\u305f\u3044\u5834\u5408\u306f\u3001if\u6587\u306e\u4e2d\u306bisset\u95a2\u6570\u3092\u4f7f\u3063\u30661\u3064\u305a\u3064\u5224\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p><b>\u914d\u5217\u306e\u4e2d\u306b\u7a7a\u306e\u8981\u7d20\u304c\u5b58\u5728\u3059\u308b\u304b<\/b>\u8abf\u3079\u305f\u3044\u5834\u5408\u306f\u3001if\u6587\u306e\u4e2d\u306bempty\u95a2\u6570\u3092\u4f7f\u3063\u3066\u30671\u3064\u305a\u3064\u5224\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>foreach\u6587\u306b\u3064\u3044\u3066\u3001\u3088\u304f\u308f\u304b\u3089\u306a\u3044\u3001\u3068\u3044\u3046\u65b9\u306f\u4e0b\u8a18\u8a18\u4e8b\u3092\u8aad\u3093\u3067\u307f\u3066\u304f\u3060\u3055\u3044\u306d\u3002<br \/>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/47603\" 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\/04\/No.4-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010\u3084\u3055\u3057\u3044PHP\u3011foreach\u6587\u306e\u57fa\u790e\u3092\u77e5\u3063\u3066\u304b\u3093\u305f\u3093\u306a\u5fdc\u7528\u3092\u8a66\u3057\u3066\u307f\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>\u3067\u306f\u6b21\u306b\u914d\u5217\u306e\u8981\u7d20\u304cNULL\u3084\u7a7a\u30010\u306e\u5834\u5408\u3001isset\u95a2\u6570\u3068empty\u95a2\u6570\u3092\u4f7f\u3063\u3066\u8981\u7d20\u30921\u3064\u305a\u3064\u5224\u5b9a\u3057\u305f\u5834\u5408\u3092\u307f\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"decode:true \">&lt;?php\r\n\r\n$fruits = ['apple',\"\", '0', NULL, 'pineapple'];\r\n\r\nforeach($fruits as $value){\r\n  \/\/isset\u95a2\u6570\u306e\u5834\u5408NULL\u4ee5\u5916\u306fTRUE\u306b\u306a\u308a\u307e\u3059\r\n  if (isset($value)){\r\n    \/\/TRUE\u306b\u306a\u308b\u5834\u5408\u306b\u4e0b\u8a18\u5185\u5bb9\u3092\u51fa\u529b\u3057\u307e\u3059\r\n    echo 'NULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093';\r\n  }else{\r\n    \/\/FALSE\u306b\u306a\u308b\u5834\u5408\u306b\u4e0b\u8a18\u5185\u5bb9\u3092\u51fa\u529b\u3057\u307e\u3059\r\n    echo 'NULL\u3067\u3059';\r\n  }\r\n  echo '&lt;br&gt;';\r\n}\r\n\r\n\r\necho '&lt;br\/&gt;';\r\necho '&lt;br\/&gt;';\r\n\r\n\r\n$fruits = ['apple',\"\", '0', NULL, 'pineapple'];\r\n\r\nforeach($fruits as $value){\r\n  \/\/empty\u95a2\u6570\u306e\u5834\u5408\u7a7a\u306e\u5834\u5408\u306fTRUE\u306b\u306a\u308a\u307e\u3059\u3002\r\n  if (empty($value)){\r\n    \/\/TRUE\u306b\u306a\u308b\u5834\u5408\u306b\u4e0b\u8a18\u5185\u5bb9\u3092\u51fa\u529b\u3057\u307e\u3059\r\n    echo '\u7a7a\u3067\u3059';\r\n  }else{\r\n    \/\/FALSE\u306b\u306a\u308b\u5834\u5408\u306b\u4e0b\u8a18\u5185\u5bb9\u3092\u51fa\u529b\u3057\u307e\u3059\r\n    echo '\u7a7a\u3067\u306f\u3042\u308a\u307e\u305b\u3093';\r\n  }\r\n  echo '&lt;br&gt;';\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">NULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\r\nNULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093\r\nNULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093\r\nNULL\u3067\u3059\r\nNULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093\r\n\r\n\r\n\u7a7a\u3067\u306f\u3042\u308a\u307e\u305b\u3093\r\n\u7a7a\u3067\u3059\r\n\u7a7a\u3067\u3059\r\n\u7a7a\u3067\u3059\r\n\u7a7a\u3067\u306f\u3042\u308a\u307e\u305b\u3093<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\u306e\u3068\u304a\u308a\u3001isset\u95a2\u6570\u3067\u306fNULL\u4ee5\u5916\u3001\u8981\u7d20\u304c\u7a7a(\u2018\u2019)\u3067\u30820\u3067\u3082\u7d50\u679c\u306f<b>\u300cNULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u300d<\/b>\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4e00\u65b9empty\u95a2\u6570\u3067\u306f\u3001\u914d\u5217$fruits\u306b\u306f\u8981\u7d20\u306e2~4\u756a\u76ee\u306b\u7a7a\u5224\u5b9a\u3055\u308c\u308b\u7a7a\u6587\u5b57\u3068\u6574\u6570\u306e0\u3001NULL\u3092\u6307\u5b9a\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u7d50\u679c\u306f<b>\u7a7a\u3067\u3059<\/b>\u3068\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>isset\u95a2\u6570\u306b\u3064\u3044\u3066\u306e\u8a73\u3057\u3044\u89e3\u8aac\u304c\u4ee5\u4e0b\u306e\u8a18\u4e8b\u306b\u3042\u308b\u306e\u3067\u4f75\u305b\u3066\u8aad\u3093\u3067\u307f\u3066\u304f\u3060\u3055\u3044\u306d\u3002<br \/>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/27735\" 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\/07\/image22-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010PHP\u5165\u9580\u3011isset\u95a2\u6570\u3067\u5909\u6570\u304c\u30bb\u30c3\u30c8\u3055\u308c\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3059\u308b\u65b9\u6cd5<\/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>empty\u30fbisset\u30fbis_null\u306e\u771f\u507d\u5024\u7d50\u679c\u4e00\u89a7<\/h2>\n<p>empty\u3084isset\u3092\u4f7f\u3063\u3066\u3044\u308b\u3068\u3001\u771f\u507d\u5024\u304c\u3069\u3046\u306a\u308b\u306e\u304b\u982d\u306e\u4e2d\u304c\u6df7\u4e71\u3057\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>empty\u3084isset\u4ee5\u5916\u3067\u3082is_null\u3068\u3044\u3046\u3001<b>NULL\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a<\/b>\u3059\u308b\u95a2\u6570\u3082\u4e00\u7dd2\u306b\u3088\u304f\u6df7\u4e71\u3092\u3057\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u306e\u3067is_null\u3082\u542b\u3081\u305f\u4e00\u89a7\u3092\u4f5c\u6210\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u6df7\u4e71\u3057\u3066\u3057\u307e\u3063\u305f\u5834\u5408\u3084\u6df7\u4e71\u3057\u306a\u3044\u305f\u3081\u306b\u3082\u3001\u771f\u507d\u5024\u7d50\u679c\u4e00\u89a7\u3068\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u4e00\u7dd2\u306b\u6d3b\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n<table id=\"tablepress-434\" class=\"tablepress tablepress-id-434\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">\u5024<\/th><th class=\"column-2\">empty<\/th><th class=\"column-3\">isset<\/th><th class=\"column-4\">is_null<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">\u2018\u6587\u5b57\u5217\u2019<\/td><td class=\"column-2\">FALSE<\/td><td class=\"column-3\">TRUE<\/td><td class=\"column-4\">FALSE<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">\u2018\u2019 (\u7a7a\u6587\u5b57\u5217)<\/td><td class=\"column-2\">TRUE<\/td><td class=\"column-3\">TRUE<\/td><td class=\"column-4\">FALSE<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">\u2018  \u2018 (\u30b9\u30da\u30fc\u30b9)<\/td><td class=\"column-2\">FALSE<\/td><td class=\"column-3\">TRUE<\/td><td class=\"column-4\">FALSE<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">0 (\u6574\u6570 \u306e 0)<\/td><td class=\"column-2\">TRUE<\/td><td class=\"column-3\">TRUE<\/td><td class=\"column-4\">FALSE<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">0.0 (\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306e 0)<\/td><td class=\"column-2\">TRUE<\/td><td class=\"column-3\">TRUE<\/td><td class=\"column-4\">FALSE<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">\u20180\u2019 (\u6587\u5b57\u5217 \u306e 0)<\/td><td class=\"column-2\">TRUE<\/td><td class=\"column-3\">TRUE<\/td><td class=\"column-4\">FALSE<\/td>\n<\/tr>\n<tr class=\"row-8\">\n\t<td class=\"column-1\">NULL<\/td><td class=\"column-2\">TRUE<\/td><td class=\"column-3\">FALSE<\/td><td class=\"column-4\">TRUE<\/td>\n<\/tr>\n<tr class=\"row-9\">\n\t<td class=\"column-1\">FALSE<\/td><td class=\"column-2\">TRUE<\/td><td class=\"column-3\">TRUE<\/td><td class=\"column-4\">FALSE<\/td>\n<\/tr>\n<tr class=\"row-10\">\n\t<td class=\"column-1\">array[] (\u7a7a\u306e\u914d\u5217)<\/td><td class=\"column-2\">TRUE<\/td><td class=\"column-3\">TRUE<\/td><td class=\"column-4\">FALSE<\/td>\n<\/tr>\n<tr class=\"row-11\">\n\t<td class=\"column-1\">$var; (\u5909\u6570\u304c\u672a\u5b9a\u7fa9)<\/td><td class=\"column-2\">TRUE<\/td><td class=\"column-3\">FALSE<\/td><td class=\"column-4\">TRUE<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-434 from cache -->\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\uff1a<\/p>\n<pre class=\"decode:true \"><!--?php $test = ['apple', ' ', \"\", '0', null, 0, 0.0]; \/\/empty\u95a2\u6570 foreach($test as $value){ \/\/empty\u306e\u5834\u5408\u7a7a\u3060\u3068TRUE\u306b\u306a\u308b if (empty($value)){ \/\/TRUE\u306e\u5834\u5408\u306b\u4e0b\u8a18\u5185\u5bb9\u3092\u51fa\u529b\u3057\u307e\u3059 echo '\u7a7a\u3067\u3059'; }else{ \/\/FALSE\u306e\u5834\u5408\u306b\u4e0b\u8a18\u5185\u5bb9\u3092\u51fa\u529b\u3057\u307e\u3059 echo '\u7a7a\u3067\u306f\u3042\u308a\u307e\u305b\u3093'; } echo '&amp;lt;br&amp;gt;'; } echo '&amp;lt;br\/&amp;gt;'; echo '&amp;lt;br\/&amp;gt;'; \/\/isset\u95a2\u6570 foreach($test as $value){ \/\/isset\u306e\u5834\u5408NULL\u4ee5\u5916\u3060\u3068TRUE\u306b\u306a\u308b if (isset($value)){ \/\/TRUE\u306e\u5834\u5408\u306b\u4e0b\u8a18\u5185\u5bb9\u3092\u51fa\u529b\u3057\u307e\u3059 echo 'NULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093'; }else{ \/\/FALSE\u306e\u5834\u5408\u306b\u4e0b\u8a18\u5185\u5bb9\u3092\u51fa\u529b\u3057\u307e\u3059 echo 'NULL\u3067\u3059'; } echo '&amp;lt;br&amp;gt;'; } echo '&amp;lt;br\/&amp;gt;'; echo '&amp;lt;br\/&amp;gt;'; \/\/is_null\u95a2\u6570 foreach($test as $value){ \/\/is_null\u306e\u5834\u5408NULL\u3060\u3068TRUE\u306b\u306a\u308b if (is_null($value)){ \/\/TRUE\u306e\u5834\u5408\u306b\u4e0b\u8a18\u5185\u5bb9\u3092\u51fa\u529b\u3057\u307e\u3059 echo 'NULL\u3067\u3059'; }else{ \/\/FALSE\u306e\u5834\u5408\u306b\u4e0b\u8a18\u5185\u5bb9\u3092\u51fa\u529b\u3057\u307e\u3059 echo 'NULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093'; } echo '&amp;lt;br&amp;gt;'; }&lt;\/pre&gt; &lt;p&gt;\u5b9f\u884c\u7d50\u679c\uff1a&lt;\/p&gt; &lt;pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \"&gt;\u7a7a\u3067\u306f\u3042\u308a\u307e\u305b\u3093 \u7a7a\u3067\u306f\u3042\u308a\u307e\u305b\u3093 \u7a7a\u3067\u3059 \u7a7a\u3067\u3059 \u7a7a\u3067\u3059 \u7a7a\u3067\u3059 \u7a7a\u3067\u3059 NULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093 NULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093 NULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093 NULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093 NULL\u3067\u3059 NULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093 NULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093 NULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093 NULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093 NULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093 NULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093 NULL\u3067\u3059 NULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093 NULL\u3067\u306f\u3042\u308a\u307e\u305b\u3093&lt;\/pre&gt; &lt;p&gt;\u4e00\u89a7\u3068\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u3082\u6df7\u4e71\u3057\u3066\u3057\u307e\u3063\u305f\u5834\u5408\u306f\u3001\u3068\u308a\u3042\u3048\u305a\u5b9f\u884c\u3057\u3066\u307f\u308b\u3068\u3044\u3044\u3067\u3059\u3088\u3002&lt;\/p&gt; &lt;h2&gt;\u914d\u5217\u306e\u7a7a\u306b\u95a2\u3059\u308b\u4ed6\u306e\u95a2\u6570&lt;\/h2&gt; &lt;p&gt;\u4eca\u56de\u306f\u3001\u914d\u5217\u306e\u8981\u7d20\u304c\u7a7a\u3067\u3042\u308b\u304b\u306e\u5224\u5b9a\u65b9\u6cd5\u3067\u3057\u305f\u304c\u3001\u95a2\u9023\u3059\u308b\u5185\u5bb9\u3067&lt;strong&gt;\u914d\u5217\u3092\u7a7a\u306b\u3059\u308b&lt;\/strong&gt;&lt;span style=\"color: #339966;\"&gt;&lt;strong&gt;unset\u95a2\u6570&lt;\/strong&gt;&lt;\/span&gt;\u3084&lt;strong&gt;\u7a7a\u306e\u8981\u7d20\u3092\u53d6\u308a\u9664\u304f&lt;\/strong&gt;&lt;span style=\"color: #339966;\"&gt;&lt;strong&gt;array_filter\u95a2\u6570&lt;\/strong&gt;&lt;\/span&gt;\u306a\u3069\u304c\u3042\u308a\u307e\u3059\u3002&lt;\/p&gt; &lt;p&gt;unset\u95a2\u6570\u3068array_filter\u95a2\u6570\u306e\u8a73\u3057\u3044\u8a18\u4e8b\u306b\u3064\u3044\u3066\u306f\u3001\u4e0b\u8a18\u3068\u306a\u308a\u307e\u3059\u3002&lt;br ?-->\r\n\u3053\u306e\u8a18\u4e8b\u306e\u6b21\u306b\u305c\u3072\u52c9\u5f37\u3057\u3066\u3001\u77e5\u8b58\u3092\u5897\u3084\u3057\u3066\u3044\u3063\u3066\u304f\u3060\u3055\u3044\u306d\u3002<\/pre>\n<p>unset\u95a2\u6570\uff1a<br \/>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/32023\" 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\/unset-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010PHP\u5165\u9580\u3011\u5909\u6570\u3001\u914d\u5217\u306e\u8981\u7d20\u3092\u524a\u9664\u3059\u308bunset\u30684\u3064\u306e\u95a2\u6570<\/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>array_filter\u95a2\u6570\uff1a<br \/>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/22620\" 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\/05\/image-4-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010PHP\u5165\u9580\u3011\u914d\u5217\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3059\u308b(array_filter)<\/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>\u914d\u5217\u3092\u6271\u3063\u305f\u51e6\u7406\u306f\u3001\u5b9f\u969b\u306e\u958b\u767a\u3067\u3082\u3088\u304f\u4f7f\u7528\u3057\u307e\u3059\u306e\u3067\u3001\u3053\u306e\u6a5f\u4f1a\u306b\u305c\u3072\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>PHP\u3092\u7d99\u7d9a\u7684\u306b\u5b66\u7fd2\u3059\u308b\u30b3\u30c4<\/h2>\n<p>PHP\u306e\u5b66\u7fd2\u3092\u3057\u3066\u3044\u3066\u3001\u308f\u304b\u3089\u306a\u3044\u3068\u3053\u308d\u304c\u591a\u304f\u4f55\u56de\u3082\u8abf\u3079\u306a\u304c\u3089\u3084\u308b\u306e\u306f\u6b63\u76f4\u3001\u5acc\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3088\u306d\u3002\u305d\u3053\u3067\u3001\u3069\u306e\u3088\u3046\u306b\u3059\u308c\u3070\u7d99\u7d9a\u7684\u306b\u5b66\u7fd2\u3092\u7d9a\u3051\u3066\u884c\u3051\u308b\u306e\u304b\u305d\u306e\u30b3\u30c4\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h3>\u76ee\u7684\u3092\u660e\u78ba\u306b\u3059\u308b<\/h3>\n<p>\u307e\u305a\u306f\u3001\u306a\u305cPHP\u3092\u5b66\u3093\u3067\u3044\u308b\u306e\u304b\u660e\u78ba\u306b\u3057\u307e\u3057\u3087\u3046\u3002\u4f8b\u3048\u3070\u3001PHP\u3092\u5b66\u3093\u3067<br \/>\n<div class=\"box01\"><\/p>\n<ul>\n<li><strong>Web\u30b5\u30a4\u30c8\u304c\u4f5c\u308a\u305f\u3044<\/strong><\/li>\n<li><strong>WordPress\u306e\u7de8\u96c6\u304c\u3057\u305f\u3044<\/strong><\/li>\n<li><strong>\u30a8\u30f3\u30b8\u30cb\u30a2\u3068\u3057\u3066\u8ee2\u8077\u3057\u305f\u3044<\/strong><\/li>\n<li><strong>\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u3092\u76ee\u6307\u3057\u305f\u3044<\/strong><\/li>\n<\/ul>\n<p><\/div><br 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class=\"box_voice\">\u8abf\u3079\u3066\u76f4\u3057\u305f\u3051\u3069\u3046\u307e\u304f\u52d5\u304b\u306a\u3044\u3057\u3069\u3046\u306a\u3063\u3066\u3093\u306e<\/div><br 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