{"id":3496,"date":"2022-11-18T18:02:07","date_gmt":"2022-11-18T09:02:07","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=3496"},"modified":"2023-07-06T17:23:39","modified_gmt":"2023-07-06T08:23:39","slug":"php0006","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/php0006\/","title":{"rendered":"\u3010PHP\u3011isset empty is_null \u306e\u4f7f\u3044\u5206\u3051\u306b\u3064\u3044\u3066\u89e3\u8aac"},"content":{"rendered":"\n

\u306f\u3058\u3081\u306b<\/h2>\n\n\n

\u57fa\u672c\u7684\u306b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306f\u5024\u306e\u4ee3\u5165\u3055\u308c\u3066\u3044\u306a\u3044\u5909\u6570\u3078\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u521d\u671f\u5316\u524d\u306e\u9818\u57df\u3078\u306e\u53c2\u7167\u3068\u3057\u3066\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002
\u305d\u308c\u3092\u56de\u907f\u3059\u308b\u305f\u3081\u306b\u306f\u5909\u6570\u306e\u5024\u304c\u521d\u671f\u5316\u6e08\u307f\u304b\u4e8b\u524d\u306b\u691c\u8a3c\u3092\u884c\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u4ed6\u8a00\u8a9e\u3060\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u66f8\u304f\u30b1\u30fc\u30b9\u3082\u3042\u308a\u307e\u3059\u304c\u3001php \u3067\u306f\u5224\u5b9a\u7528\u306e\u5c02\u7528\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n

$value == null<\/pre><\/div>\n\n\n
php \u3067\u306f isset , empty , is_null \u3068\u3044\u3063\u305f\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u5024\u5224\u5b9a\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n
\u3053\u3053\u304b\u3089\u306f\u5404\u30e1\u30bd\u30c3\u30c9\u306e\u5f79\u5272\u3001\u304a\u3088\u3073\u5b9f\u969b\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n
\n
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\"IT\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u5b66\u6821<\/a><\/div>\n
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\u5404\u30e1\u30bd\u30c3\u30c9\u306e\u5f79\u5272\u3068\u4f7f\u3044\u5206\u3051<\/h2>\n\n\n
\u57fa\u672c\u7684\u306b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3051\u308b if \u306f true \u306e\u5834\u5408\u306b\u5b9f\u884c\u3057\u305f\u3044\u51e6\u7406\u3092\u66f8\u304f\u3053\u3068\u304c\u57fa\u672c\u3067\u3059\u3002
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\u5404\u30e1\u30bd\u30c3\u30c9\u306e\u52d5\u4f5c\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
\u5404\u30e1\u30bd\u30c3\u30c9\u306e\u52d5\u4f5c<\/strong><\/p>\n\n\n
 \u30e1\u30bd\u30c3\u30c9<\/strong><\/td> \u52d5\u4f5c<\/strong><\/td><\/tr>
 isset<\/td>\u5024\u304c\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u306b true \u3001null \u306e\u5834\u5408\u306f false \u306e\u5024\u3092\u767a\u751f\u3055\u305b\u308b\u3002<\/td><\/tr>
 empty<\/td>\u5024\u304c\u683c\u7d0d\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u306b true \u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306b false \u306e\u5024\u3092\u767a\u751f\u3055\u305b\u308b\u3002<\/td><\/tr>
 is_null<\/td>\u5024\u304c null \u3067\u3042\u308b\u5834\u5408\u306b true \u3001\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306b false \u304c\u623b\u308a\u5024\u3068\u306a\u308b\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n
\u5b9f\u5229\u7528\u6642\u306e\u623b\u308a\u5024\u4f8b<\/strong><\/p>\n\n\n
 \u540d\u79f0<\/strong><\/td> \u7a2e\u5225<\/strong><\/td> \u672a\u5b9a\u7fa9\u5909\u6570<\/strong><\/td> NULL<\/strong><\/td> 0<\/strong><\/td> String(“”)<\/strong><\/td> String(“aiueo”) <\/strong><\/td> \u7a7a\u914d\u5217<\/strong><\/td><\/tr>
 isset<\/td> \u8a00\u8a9e\u69cb\u9020<\/td> False<\/td> False<\/td> True<\/td> True<\/td> True<\/td> True<\/td><\/tr>
 empty<\/td> \u8a00\u8a9e\u69cb\u9020<\/td> True<\/td> True<\/td>True<\/td> True<\/td> False<\/td> True<\/td><\/tr>
 is_null<\/td> \u95a2\u6570<\/td> True<\/td> True<\/td>False<\/td> False<\/td> False<\/td> False<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n
\u8a00\u8a9e\u69cb\u9020\u3068\u306f\u8a00\u8a9e\u305d\u306e\u3082\u306e\u306b\u30cf\u30fc\u30c9\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3055\u308c\u305f\u51e6\u7406\u3092\u6307\u3057\u3001\u95a2\u6570\u3088\u308a\u3082\u5148\u306b\u53c2\u7167\u3055\u308c\u308b\u3053\u3068\u304b\u3089\u51e6\u7406\u901f\u5ea6\u304c\u65e9\u3044\u3068\u3044\u3046\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\u3002
\u305d\u306e\u305f\u3081\u3053\u308c\u3089\u306e\u5224\u5b9a\u51e6\u7406\u3092\u884c\u3046\u5834\u5408\u306f isset \u3084 empty \u3092\u4f7f\u7528\u3059\u308b\u3068\u7121\u99c4\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
\u300c\u5024\u304c\u5165\u3063\u3066\u3044\u308b\u304b\u3092\u78ba\u304b\u3081\u3066\u3001\u3082\u3057\u5024\u304c\u5b58\u5728\u3057\u306a\u304b\u3063\u305f\u3089\u30a8\u30e9\u30fc\u3092\u767a\u751f\u3055\u305b\u305f\u3044\u300d\u3068\u3044\u3063\u305f\u5834\u5408\u306f\u5224\u5b9a\u6761\u4ef6\u304c\u6b63\u3068\u306a\u308b\u305f\u3081 isset\u3002
\u300c\u5024\u304c\u5165\u3063\u3066\u3044\u306a\u304b\u3063\u305f\u5834\u5408\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u4ee3\u5165\u3057\u305f\u3044\u300d\u3068\u3044\u3063\u305f\u5834\u5408\u306f\u5224\u5b9a\u6761\u4ef6\u304c\u8ca0\u3068\u306a\u308b\u305f\u3081 empty \u3092\u4f7f\u3046\u3068\u826f\u3044\u3067\u3059\u306d\u3002<\/p>\n
\u3042\u304f\u307e\u3067\u3082\u3053\u308c\u3089\u306e\u51e6\u7406\u306f\u5909\u6570\u306e\u5024\u306e\u6709\u7121\u3092\u691c\u8a3c\u3059\u308b\u305f\u3081\u3060\u3051\u306b\u5b58\u5728\u3059\u308b\u305f\u3081 isset \u7b49\u306f\u7a7a\u914d\u5217 \u3067\u3082 True \u3068\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u691c\u8a3c\u306b\u306f\u5411\u304b\u306a\u3044\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3002
\u914d\u5217\u306e\u8981\u7d20\u304c\u5b58\u5728\u3059\u308b\u304b\u3092\u78ba\u8a8d\u3057\u305f\u3044\u5834\u5408\u306f\u300ccount\u300d\u3092\u7528\u3044\u305f\u308a\u3001\u8981\u7d20\u756a\u53f7\u3092\u76f4\u63a5\u6307\u5b9a\u3059\u308b\u300cisset( $value[0] )\u300d\u3068\u3044\u3063\u305f\u65b9\u6cd5\u3067\u691c\u8a3c\u3092\u884c\u3046\u5fc5\u8981\u304c\u3042\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u300c!empty($value)\u300d\u3068\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u304c\u3001\u300c\u5024\u304c\u5165\u3063\u3066\u3044\u305f\u3089\u300d\u3068\u3044\u3046\u6761\u4ef6\u306b\u5bfe\u3057\u3066\u306e\u64cd\u4f5c\u3067\u3042\u308b\u306b\u3082\u95a2\u308f\u3089\u305a empty \u3092\u7528\u3044\u308b\u3068\u5426\u5b9a\u6761\u4ef6\u306e if \u6587\u3068\u306a\u308a\u53ef\u8aad\u6027\u304c\u843d\u3061\u308b\u305f\u3081\u63a8\u5968\u3067\u304d\u307e\u305b\u3093\u3002
\u6700\u5f8c\u306b\u3001\u4e0a\u8a18\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u691c\u8a3c\u3057\u305f\u30b5\u30f3\u30d7\u30eb\u3068\u5b9f\u884c\u7d50\u679c\u3092\u8a18\u8f09\u3057\u307e\u3059\u305f\u3081\u3001\u53c2\u8003\u306b\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u5c1a\u3001is_null \u306f\u672a\u5b9a\u7fa9\u5909\u6570\u3092\u5224\u5b9a\u3057\u3088\u3046\u3068\u3059\u308b\u3068 \u8b66\u544a\u8868\u793a notice \u3068\u306a\u308b\u305f\u3081\u7701\u7565\u3057\u305f\u30ea\u30b9\u30c8\u3068\u306a\u308a\u307e\u3059\u3002
\u3054\u627f\u77e5\u304a\u304d\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n
\u30b5\u30f3\u30d7\u30eb<\/h2>\n\n\n\n
<?php\n\/\/ Your code here!\n$nullValue = null;\n$intValue = 0;\n$strEmptyValue = \"\";\n$strValue = \"aiueo\";\n$arrayValue = [];\necho( isset( $value ) ? \"\u672a\u5b9a\u7fa9\u5909\u6570 \u306f isset \u306b\u304a\u3044\u3066 true\" : \"\u672a\u5b9a\u7fa9\u5909\u6570 \u306f isset \u306b\u304a\u3044\u3066 false\");\necho(\"\\n\");\necho( isset( $nullValue ) ? \"nullValue \u306f isset \u306b\u304a\u3044\u3066 true\" : \"nullValue \u306f isset \u306b\u304a\u3044\u3066 false\");\necho(\"\\n\");\necho( isset( $intValue ) ? \"intValue \u306f isset \u306b\u304a\u3044\u3066 true\" : \"intValue \u306f isset \u306b\u304a\u3044\u3066 false\" );\necho(\"\\n\");\necho( isset( $strEmptyValue ) ? \"strEmptyValue \u306f isset \u306b\u304a\u3044\u3066 true\" : \"strEmptyValue \u306f isset \u306b\u304a\u3044\u3066 false\" );\necho(\"\\n\");\necho( isset( $strValue ) ? \"strValue \u306f isset \u306b\u304a\u3044\u3066 true\" : \"strValue \u306f isset \u306b\u304a\u3044\u3066 false\" );\necho(\"\\n\");\necho( isset( $arrayValue ) ? \"arrayValue \u306f isset \u306b\u304a\u3044\u3066 true\" : \"arrayValue \u306f isset \u306b\u304a\u3044\u3066 false\" );\necho(\"\\n\");\necho(\"\\n\");\necho( empty( $value ) ? \"\u672a\u5b9a\u7fa9\u5909\u6570 \u306f empty \u306b\u304a\u3044\u3066 true\" : \"\u672a\u5b9a\u7fa9\u5909\u6570 \u306f empty \u306b\u304a\u3044\u3066 false\");\necho(\"\\n\");\necho( empty( $nullValue ) ? \"nullValue \u306f empty \u306b\u304a\u3044\u3066 true\" : \"nullValue \u306f empty \u306b\u304a\u3044\u3066 false\");\necho(\"\\n\");\necho( empty( $intValue ) ? \"intValue \u306f empty \u306b\u304a\u3044\u3066 true\" : \"intValue \u306f empty \u306b\u304a\u3044\u3066 false\" );\necho(\"\\n\");\necho( empty( $strEmptyValue ) ? \"strEmptyValue \u306f empty \u306b\u304a\u3044\u3066 true\" : \"strEmptyValue \u306f empty \u306b\u304a\u3044\u3066 false\" );\necho(\"\\n\");\necho( empty( $strValue ) ? \"strValue \u306f empty \u306b\u304a\u3044\u3066 true\" : \"strValue \u306f empty \u306b\u304a\u3044\u3066 false\" );\necho(\"\\n\");\necho( empty( $arrayValue ) ? \"arrayValue \u306f empty \u306b\u304a\u3044\u3066 true\" : \"arrayValue \u306f empty \u306b\u304a\u3044\u3066 false\" );\necho(\"\\n\");\necho(\"\\n\");\necho( is_null( $nullValue ) ? \"nullValue \u306f is_null \u306b\u304a\u3044\u3066 true\" : \"nullValue \u306f is_null \u306b\u304a\u3044\u3066 false\");\necho(\"\\n\");\necho( is_null( $intValue ) ? \"intValue \u306f is_null \u306b\u304a\u3044\u3066 true\" : \"intValue \u306f is_null \u306b\u304a\u3044\u3066 false\" );\necho(\"\\n\");\necho( is_null( $strEmptyValue ) ? \"strEmptyValue \u306f is_null \u306b\u304a\u3044\u3066 true\" : \"strEmptyValue \u306f is_null \u306b\u304a\u3044\u3066 false\" );\necho(\"\\n\");\necho( is_null( $strValue ) ? \"strValue \u306f is_null \u306b\u304a\u3044\u3066 true\" : \"strValue \u306f is_null \u306b\u304a\u3044\u3066 false\" );\necho(\"\\n\");\necho( is_null( $arrayValue ) ? \"arrayValue \u306f is_null \u306b\u304a\u3044\u3066 true\" : \"arrayValue \u306f is_null \u306b\u304a\u3044\u3066 false\" );\n?><\/pre><\/div>\n\n\n\n
\u5b9f\u884c\u7d50\u679c<\/h2>\n\n\n\n
\u672a\u5b9a\u7fa9\u5909\u6570 \u306f isset \u306b\u304a\u3044\u3066 false\nnullValue \u306f isset \u306b\u304a\u3044\u3066 false\nintValue \u306f isset \u306b\u304a\u3044\u3066 true\nstrEmptyValue \u306f isset \u306b\u304a\u3044\u3066 true\nstrValue \u306f isset \u306b\u304a\u3044\u3066 true\narrayValue \u306f isset \u306b\u304a\u3044\u3066 true\n\u672a\u5b9a\u7fa9\u5909\u6570 \u306f empty \u306b\u304a\u3044\u3066 true\nnullValue \u306f empty \u306b\u304a\u3044\u3066 true\nintValue \u306f empty \u306b\u304a\u3044\u3066 true\nstrEmptyValue \u306f empty \u306b\u304a\u3044\u3066 true\nstrValue \u306f empty \u306b\u304a\u3044\u3066 false\narrayValue \u306f empty \u306b\u304a\u3044\u3066 true\nnullValue \u306f is_null \u306b\u304a\u3044\u3066 true\nintValue \u306f is_null \u306b\u304a\u3044\u3066 false\nstrEmptyValue \u306f is_null \u306b\u304a\u3044\u3066 false\nstrValue \u306f is_null \u306b\u304a\u3044\u3066 false\narrayValue \u306f is_null \u306b\u304a\u3044\u3066 false<\/pre><\/div>\n\n\n
\u4ee5\u4e0a\u3068\u306a\u308a\u307e\u3059\u3002
\u305d\u308c\u3067\u306f\u826f\u304d php \u30e9\u30a4\u30d5\u3092\uff01<\/p>\n\n\n
PHP\u306e\u52c9\u5f37\u65b9\u6cd5\u306f\uff1f<\/h2>\n\n\n
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