{"id":30215,"date":"2023-09-08T19:14:36","date_gmt":"2023-02-12T15:02:24","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8e-php-empty-%e5%87%bd%e6%95%b0%e7%9a%84%e8%a7%84%e8%8c%83\/"},"modified":"2025-08-12T18:08:07","modified_gmt":"2025-08-12T10:08:07","slug":"%e5%85%b3%e4%ba%8e-php-empty-%e5%87%bd%e6%95%b0%e7%9a%84%e8%a7%84%e8%8c%83","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8e-php-empty-%e5%87%bd%e6%95%b0%e7%9a%84%e8%a7%84%e8%8c%83\/","title":{"rendered":"\u5173\u4e8e PHP empty() \u51fd\u6570\u7684\u89c4\u8303"},"content":{"rendered":"<h1>\u9996\u5148\u672c\u6587\u662f\u4e3a\u90a3\u4e9b\u5bb9\u6613\u5fd8\u8bb0empty()\u51fd\u6570\u89c4\u8303\u6216\u60f3\u4e86\u89e3\u5176\u89c4\u8303\u7684\u4eba\u64b0\u5199\u7684\u3002\u5982\u679c\u60a8\u60f3\u770b\u7ed3\u8bba\uff0c\u8bf7\u67e5\u770b\u4e0b\u9762\u7684\u201c\u603b\u7ed3\u201d\u8868\u683c\u3002<\/p>\n<h1>\u5728\u4e2d\u6587\u4e2d\uff0c\u53ea\u9700\u8981\u4e00\u79cd\u9009\u9879\u6765\u91ca\u4e49&#8221;\u524d\u63d0&#8221;\uff1a\u5148\u51b3\u6761\u4ef6\u3002<\/p>\n<ul class=\"post-ul\">PHP8.1<\/ul>\n<h1>\u5173\u4e8eempty\u7684\u89c4\u683c\u8bf4\u660e\u6839\u636e\u516c\u5f0f\u6587\u6863\uff0cempty()\u7684\u7ed3\u679c\u4f3c\u4e4e\u4e0e!isset($var) || $var == false\u76f8\u540c\u3002<\/p>\n<blockquote><p>\u5373\u4f7f\u53d8\u91cf\u4e0d\u5b58\u5728\uff0c\u4e5f\u4e0d\u4f1a\u53d1\u51fa\u8b66\u544a\u3002\u6362\u53e5\u8bdd\u8bf4\uff0cempty()\u7b80\u6d01\u5730\u63cf\u8ff0\u4e86!isset($var) || $var == false\u7684\u672c\u8d28\u3002<\/p><\/blockquote>\n<p>&nbsp;<\/p>\n<p>\u4e3a\u4e86\u8be6\u7ec6\u4e86\u89e3empty()\u7684\u884c\u4e3a\uff0c\u6211\u4eec\u60f3\u8981\u89c2\u5bdfisset()\u548c$var == false\u7684\u5224\u5b9a\u5404\u81ea\u4f1a\u4ea7\u751f\u4ec0\u4e48\u6837\u7684\u7ed3\u679c\u3002<\/p>\n<h2>!isset()\u7684\u884c\u4e3a\u9996\u5148\uff0c\u5173\u4e8eisset()\u7684\u884c\u4e3a\uff0c\u5f53\u53c2\u6570\u662f\u672a\u5b9a\u4e49\u7684\u53d8\u91cf\u6216\u8005null\u65f6\uff0c\u5b83\u4f1a\u8fd4\u56defalse\u3002\u800c!isset()\u5219\u662f\u8fd4\u56de\u76f8\u53cd\u7684\u7ed3\u679c\uff0c\u5373\u5bf9\u4e8e\u672a\u5b9a\u4e49\u7684\u53d8\u91cf\u548cnull\uff0c\u5b83\u4f1a\u8fd4\u56detrue\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u4ee5\u4e0b\u662f\u7528\u4e8e\u786e\u8ba4!isset()\u51fd\u6570\u884c\u4e3a\u7684\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"cp\">&lt;?php<\/span>\r\n<span class=\"nv\">$ary1<\/span> <span class=\"o\">=<\/span> <span class=\"p\">[];<\/span>\r\n<span class=\"nv\">$ary2<\/span> <span class=\"o\">=<\/span> <span class=\"p\">[<\/span>\r\n\t<span class=\"s1\">''<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"s2\">\"\"<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"p\">[],<\/span>\r\n\t<span class=\"kc\">true<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"kc\">false<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"mi\">0<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"mi\">1<\/span><span class=\"p\">,<\/span>\r\n \t<span class=\"s1\">'0'<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"s1\">'1'<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"nb\">sqrt<\/span><span class=\"p\">(<\/span><span class=\"o\">-<\/span><span class=\"mi\">1<\/span><span class=\"p\">),<\/span> <span class=\"c1\">\/\/ NAN\u3092\u8fd4\u3059<\/span>\r\n \t<span class=\"kc\">null<\/span><span class=\"p\">,<\/span>\r\n \t<span class=\"nv\">$foo<\/span><span class=\"p\">,<\/span> <span class=\"c1\">\/\/ \u672a\u5b9a\u7fa9\u306e\u5909\u6570<\/span>\r\n \t<span class=\"nv\">$ary1<\/span><span class=\"p\">[<\/span><span class=\"s1\">'foo'<\/span><span class=\"p\">],<\/span> <span class=\"c1\">\/\/ \u672a\u5b9a\u7fa9\u306e\u914d\u5217\u30ad\u30fc<\/span>\r\n<span class=\"p\">];<\/span>\r\n<span class=\"k\">foreach<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$ary2<\/span> <span class=\"k\">as<\/span> <span class=\"nv\">$value<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"nb\">var_dump<\/span><span class=\"p\">(<\/span><span class=\"o\">!<\/span><span class=\"k\">isset<\/span><span class=\"p\">(<\/span><span class=\"nv\">$value<\/span><span class=\"p\">));<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5904\u7406\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code><span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">false<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">false<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">false<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">false<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">false<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">false<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">false<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">false<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">false<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">false<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">true<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">true<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">true<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>\u203b$foo\u3068$ary[&#8216;foo]\u3092\u914d\u5217\u306b\u30bb\u30c3\u30c8\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u8b66\u544a\u6587\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>$ary[&#8216;foo&#8217;]\u306b\u3064\u3044\u3066\u3067\u3059\u304c\u3001\u914d\u5217\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u30ad\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3057\u305f\u5834\u5408\u3001\u672a\u5b9a\u7fa9\u306e\u5909\u6570\u306b\u30a2\u30af\u30bb\u30b9\u3057\u305f\u6642\u3068\u540c\u3058\u6319\u52d5\u306b\u306a\u308b\u306e\u3067true\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u6570\u503c\u548c\u5224\u65ad\u7ed3\u679c\u7684\u8868\u683c<\/p>\n<div>\n<div class=\"post-table\">\u5024\u5224\u5b9a\u7d50\u679c&#8221;<span style=\"color: #ff9642;\">false<\/span>&#8220;&#8221;<span style=\"color: #ff9642;\">false<\/span>[]<span style=\"color: #ff9642;\">false<\/span>true<span style=\"color: #ff9642;\">false<\/span>false<span style=\"color: #ff9642;\">false<\/span>0<span style=\"color: #ff9642;\">false<\/span>1<span style=\"color: #ff9642;\">false<\/span>&#8216;0&#8217;<span style=\"color: #ff9642;\">false<\/span>&#8216;1&#8217;<span style=\"color: #ff9642;\">false<\/span>NAN<span style=\"color: #ff9642;\">false<\/span>null<span style=\"color: #0074cc;\">true<\/span>\u672a\u5b9a\u7fa9\u5909\u6570<span style=\"color: #0074cc;\">true<\/span>\u672a\u5b9a\u306e\u914d\u5217\u30ad\u30fc<span style=\"color: #0074cc;\">true<\/span><\/p>\n<h2>$var\u4e3afalse\u65f6\u7684\u884c\u4e3a<br \/>\n\u6211\u901a\u8fc7\u4e0b\u9762\u7684\u4ee3\u7801\u6765\u786e\u8ba4\u5f53\u7528\u76f8\u7b49\u8fd0\u7b97\u7b26\u201c==\u201d\u5c06\u6bcf\u4e2a\u503c\u4e0efalse\u8fdb\u884c\u6bd4\u8f83\u65f6\u4f1a\u5f97\u5230\u4ec0\u4e48\u6837\u7684\u7ed3\u679c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"cp\">&lt;?php<\/span>\r\n<span class=\"nv\">$ary1<\/span> <span class=\"o\">=<\/span> <span class=\"p\">[];<\/span>\r\n<span class=\"nv\">$ary2<\/span> <span class=\"o\">=<\/span> <span class=\"p\">[<\/span>\r\n\t<span class=\"s1\">''<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"s2\">\"\"<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"p\">[],<\/span>\r\n\t<span class=\"kc\">true<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"kc\">false<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"mi\">0<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"mi\">1<\/span><span class=\"p\">,<\/span>\r\n \t<span class=\"s1\">'0'<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"s1\">'1'<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"nb\">sqrt<\/span><span class=\"p\">(<\/span><span class=\"o\">-<\/span><span class=\"mi\">1<\/span><span class=\"p\">),<\/span> <span class=\"c1\">\/\/ NAN\u3092\u8fd4\u3059<\/span>\r\n \t<span class=\"kc\">null<\/span><span class=\"p\">,<\/span>\r\n \t<span class=\"nv\">$foo<\/span><span class=\"p\">,<\/span> <span class=\"c1\">\/\/ \u672a\u5b9a\u7fa9\u306e\u5909\u6570<\/span>\r\n \t<span class=\"nv\">$ary1<\/span><span class=\"p\">[<\/span><span class=\"s1\">'foo'<\/span><span class=\"p\">],<\/span> <span class=\"c1\">\/\/ \u672a\u5b9a\u7fa9\u306e\u914d\u5217\u30ad\u30fc<\/span>\r\n<span class=\"p\">];<\/span>\r\n<span class=\"k\">foreach<\/span> <span class=\"p\">(<\/span><span class=\"nv\">$ary2<\/span> <span class=\"k\">as<\/span> <span class=\"nv\">$value<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"nb\">var_dump<\/span><span class=\"p\">(<\/span><span class=\"nv\">$value<\/span> <span class=\"o\">==<\/span> <span class=\"kc\">false<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5904\u7406\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code><span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">true<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">true<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">true<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">false<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">true<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">true<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">false<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">true<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">false<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">false<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">true<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">true<\/span><span class=\"p\">)<\/span>\r\n<span class=\"nf\">bool<\/span><span class=\"p\">(<\/span><span class=\"kc\">true<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>\u203b$foo\u3068$ary[&#8216;foo]\u3092\u914d\u5217\u306b\u30bb\u30c3\u30c8\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u8b66\u544a\u6587\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u503c\u548c\u5224\u65ad\u7ed3\u679c\u7684\u8868\u683c<\/p>\n<div>\n<div class=\"post-table\">\u5024\u5224\u5b9a\u7d50\u679c&#8221;<span style=\"color: #0074cc;\">true<\/span>&#8220;&#8221;<span style=\"color: #0074cc;\">true<\/span>[]<span style=\"color: #0074cc;\">true<\/span>true<span style=\"color: #ff9642;\">false<\/span>false<span style=\"color: #0074cc;\">true<\/span>0<span style=\"color: #0074cc;\">true<\/span>1<span style=\"color: #ff9642;\">false<\/span>&#8216;0&#8217;<span style=\"color: #0074cc;\">true<\/span>&#8216;1&#8217;<span style=\"color: #ff9642;\">false<\/span>NAN<span style=\"color: #ff9642;\">false<\/span>null<span style=\"color: #0074cc;\">true<\/span>\u672a\u5b9a\u7fa9\u5909\u6570<span style=\"color: #0074cc;\">true<\/span>\u672a\u5b9a\u306e\u914d\u5217\u30ad\u30fc<span style=\"color: #0074cc;\">true<\/span>\u4e0e!isset()\u7684\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\uff0c\u5f53\u4e3a\u7a7a\u5b57\u7b26\u4e32\u3001\u7a7a\u6570\u7ec4\u30010\u6216&#8217;0&#8217;\u65f6\uff0c\u5176\u8fd4\u56detrue\u3002<\/p>\n<h1>\u603b\u7ed3<br \/>\n\u4ee5\u4e0b\u662f\u6bcf\u4e2a\u5224\u65ad\u7ed3\u679c\u7684\u65b9\u5f0f\uff1a<br \/>\n&#8211; !isset()\uff1a\u5224\u65ad\u53d8\u91cf\u662f\u5426\u5df2\u8bbe\u7f6e<br \/>\n&#8211; $var == false\uff1a\u5224\u65ad\u53d8\u91cf\u662f\u5426\u4e3a\u5047<br \/>\n&#8211; empty()\uff1a\u5224\u65ad\u53d8\u91cf\u662f\u5426\u4e3a\u7a7a<\/p>\n<div>\n<div class=\"post-table\">\u5024!isset()$var == falseempty()&#8221;<span style=\"color: #ff9642;\">false<\/span><span style=\"color: #0074cc;\">true<\/span><span style=\"color: #0074cc;\">true<\/span>&#8220;&#8221;<span style=\"color: #ff9642;\">false<\/span><span style=\"color: #0074cc;\">true<\/span><span style=\"color: #0074cc;\">true<\/span>[]<span style=\"color: #ff9642;\">false<\/span><span style=\"color: #0074cc;\">true<\/span><span style=\"color: #0074cc;\">true<\/span>true<span style=\"color: #ff9642;\">false<\/span><span style=\"color: #ff9642;\">false<\/span><span style=\"color: #ff9642;\">false<\/span>false<span style=\"color: #ff9642;\">false<\/span><span style=\"color: #0074cc;\">true<\/span><span style=\"color: #0074cc;\">true<\/span>0<span style=\"color: #ff9642;\">false<\/span><span style=\"color: #0074cc;\">true<\/span><span style=\"color: #0074cc;\">true<\/span>1<span style=\"color: #ff9642;\">false<\/span><span style=\"color: #ff9642;\">false<\/span><span style=\"color: #ff9642;\">false<\/span>&#8216;0&#8217;<span style=\"color: #ff9642;\">false<\/span><span style=\"color: #0074cc;\">true<\/span><span style=\"color: #0074cc;\">true<\/span>&#8216;1&#8217;<span style=\"color: #ff9642;\">false<\/span><span style=\"color: #ff9642;\">false<\/span><span style=\"color: #ff9642;\">false<\/span>NAN<span style=\"color: #ff9642;\">false<\/span><span style=\"color: #ff9642;\">false<\/span><span style=\"color: #ff9642;\">false<\/span>null<span style=\"color: #0074cc;\">true<\/span><span style=\"color: #0074cc;\">true<\/span><span style=\"color: #0074cc;\">true<\/span>\u672a\u5b9a\u7fa9\u5909\u6570<span style=\"color: #0074cc;\">true<\/span><span style=\"color: #0074cc;\">true<\/span><span style=\"color: #0074cc;\">true<\/span>\u672a\u5b9a\u306e\u914d\u5217\u30ad\u30fc<span style=\"color: #0074cc;\">true<\/span><span style=\"color: #0074cc;\">true<\/span><span style=\"color: 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