{"id":30683,"date":"2022-11-19T20:53:37","date_gmt":"2023-06-12T22:16:11","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8php%e4%b8%ad%e9%98%b2%e6%ad%a2undefinedindex%e9%94%99%e8%af%af\/"},"modified":"2025-08-12T20:20:01","modified_gmt":"2025-08-12T12:20:01","slug":"%e5%9c%a8php%e4%b8%ad%e9%98%b2%e6%ad%a2undefinedindex%e9%94%99%e8%af%af","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8php%e4%b8%ad%e9%98%b2%e6%ad%a2undefinedindex%e9%94%99%e8%af%af\/","title":{"rendered":"\u5728PHP\u4e2d\u9632\u6b62UndefinedIndex\u9519\u8bef"},"content":{"rendered":"<p>\u5728\u4f7f\u7528\u591a\u5c42\u6b21\u6570\u7ec4\u65f6\uff0c\u60a8\u662f\u5426\u4f1a\u9047\u5230UndefinedIndex\u7684\u95ee\u9898\uff1f<br \/>\n\u6211\u5df2\u7ecf\u53d1\u660e\u4e86\u4e00\u4e2a\u53ef\u4ee5\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u51fd\u6570\uff01\uff08\u867d\u7136\u5b83\u53ea\u662f\u975e\u5e38\u7b80\u5355\u7684\u4ee3\u7801\uff09<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">if<\/span> <span class=\"p\">(<\/span><span class=\"o\">!<\/span><span class=\"nb\">function_exists<\/span><span class=\"p\">(<\/span><span class=\"s1\">'IFERROR'<\/span><span class=\"p\">)){<\/span>\r\n    <span class=\"k\">function<\/span> <span class=\"n\">IFERROR<\/span><span class=\"p\">(<\/span><span class=\"nv\">$ary<\/span><span class=\"p\">,<\/span><span class=\"nv\">$idx<\/span><span class=\"p\">,<\/span><span class=\"nv\">$val<\/span><span class=\"o\">=<\/span><span class=\"s1\">'-'<\/span><span class=\"p\">){<\/span>\r\n        <span class=\"k\">if<\/span> <span class=\"p\">(<\/span><span class=\"nb\">is_string<\/span><span class=\"p\">(<\/span><span class=\"nv\">$idx<\/span><span class=\"p\">)<\/span> <span class=\"o\">||<\/span> <span class=\"nb\">is_numeric<\/span><span class=\"p\">(<\/span><span class=\"nv\">$idx<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"p\">(<\/span><span class=\"k\">isset<\/span><span class=\"p\">(<\/span><span class=\"nv\">$ary<\/span><span class=\"p\">[<\/span><span class=\"nv\">$idx<\/span><span class=\"p\">]))<\/span> <span class=\"o\">?<\/span> <span class=\"nv\">$ary<\/span><span class=\"p\">[<\/span><span class=\"nv\">$idx<\/span><span class=\"p\">]<\/span> <span class=\"o\">:<\/span> <span class=\"nv\">$val<\/span><span class=\"p\">;<\/span>\r\n        <span class=\"p\">}<\/span><span class=\"k\">else<\/span><span class=\"p\">{<\/span>\r\n            <span class=\"k\">foreach<\/span><span class=\"p\">(<\/span><span class=\"nv\">$idx<\/span> <span class=\"k\">as<\/span> <span class=\"nv\">$i<\/span><span class=\"p\">){<\/span>\r\n                <span class=\"k\">if<\/span> <span class=\"p\">(<\/span><span class=\"o\">!<\/span><span class=\"k\">isset<\/span><span class=\"p\">(<\/span><span class=\"nv\">$ary<\/span><span class=\"p\">[<\/span><span class=\"nv\">$i<\/span><span class=\"p\">])){<\/span>\r\n                    <span class=\"k\">return<\/span> <span class=\"nv\">$val<\/span><span class=\"p\">;<\/span>\r\n                <span class=\"p\">}<\/span><span class=\"k\">else<\/span><span class=\"p\">{<\/span>\r\n                    <span class=\"nv\">$ary<\/span> <span class=\"o\">=<\/span> <span class=\"nv\">$ary<\/span><span class=\"p\">[<\/span><span class=\"nv\">$i<\/span><span class=\"p\">];<\/span>\r\n                <span class=\"p\">}<\/span>\r\n            <span class=\"p\">}<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"nv\">$ary<\/span><span class=\"p\">;<\/span>\r\n        <span class=\"p\">}<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u8fd0\u7528\u65b9\u6cd5<\/p>\n<pre class=\"post-pre\"><code><span class=\"nv\">$ary<\/span> <span class=\"o\">=<\/span> <span class=\"p\">[<\/span><span class=\"s1\">'abc'<\/span><span class=\"o\">=&gt;<\/span><span class=\"p\">[<\/span><span class=\"s1\">'x'<\/span><span class=\"o\">=&gt;<\/span><span class=\"s1\">'test'<\/span><span class=\"p\">,<\/span><span class=\"s1\">'def'<\/span><span class=\"o\">=&gt;<\/span><span class=\"s1\">'test2'<\/span><span class=\"p\">]];<\/span> <span class=\"c1\">\/\/\u3053\u3093\u306a\u914d\u5217\u304c\u3042\u3063\u305f\u3068\u3057\u3066<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u968e\u5c64\u9806\u306eindex\u3092\u914d\u5217\u3067\u3000$ary['abc']['def'] \u306e\u3088\u3046\u306a\u5834\u5408<\/span>\r\n<span class=\"nv\">$idx<\/span> <span class=\"o\">=<\/span> <span class=\"p\">[<\/span><span class=\"s1\">'abc'<\/span><span class=\"p\">,<\/span><span class=\"s1\">'def'<\/span><span class=\"p\">];<\/span>\r\n<span class=\"nf\">IFERROR<\/span><span class=\"p\">(<\/span><span class=\"nv\">$ary<\/span><span class=\"p\">,<\/span><span class=\"nv\">$idx<\/span><span class=\"p\">,<\/span><span class=\"s1\">'-'<\/span><span class=\"p\">);<\/span>  <span class=\"c1\">\/\/ index\u304c\u3042\u308b\u5834\u5408\u3001\u5024\u3092\u3001\u306a\u3044\u5834\u5408\"-\"\u3092\u8fd4\u3059<\/span>\r\n\r\n<span class=\"nf\">IFERROR<\/span><span class=\"p\">(<\/span><span class=\"nv\">$ary<\/span><span class=\"p\">,[<\/span><span class=\"s1\">'abc'<\/span><span class=\"p\">,<\/span><span class=\"s1\">'efg'<\/span><span class=\"p\">],<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span>  <span class=\"c1\">\/\/ =&gt; 0<\/span>\r\n<span class=\"nf\">IFERROR<\/span><span class=\"p\">(<\/span><span class=\"nv\">$ary<\/span><span class=\"p\">,[<\/span><span class=\"s1\">'abc'<\/span><span class=\"p\">,<\/span><span class=\"s1\">'def'<\/span><span class=\"p\">],<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span>  <span class=\"c1\">\/\/ =&gt; \"test2\"<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u4f7f\u7528\u591a\u5c42\u6b21\u6570\u7ec4\u65f6\uff0c\u60a8\u662f\u5426\u4f1a\u9047\u5230UndefinedIndex\u7684\u95ee\u9898\uff1f \u6211\u5df2\u7ecf\u53d1\u660e\u4e86\u4e00\u4e2a\u53ef\u4ee5\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u51fd\u6570\uff01 [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-30683","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5728PHP\u4e2d\u9632\u6b62UndefinedIndex\u9519\u8bef - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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