{"id":1236,"date":"2025-09-29T18:50:35","date_gmt":"2025-09-29T10:50:35","guid":{"rendered":"https:\/\/www.zhaozhao123.cn\/php\/yycxsc\/1236.html"},"modified":"2025-09-29T18:53:13","modified_gmt":"2025-09-29T10:53:13","slug":"php%e5%88%a4%e6%96%ad%e6%9f%90%e6%95%b0%e7%bb%84%e4%b8%ad%e6%98%af%e5%90%a6%e5%ad%98%e5%9c%a8%e6%8c%87%e5%ae%9a%e9%94%ae%e5%90%8d%e7%9a%84%e6%96%b9%e6%b3%95","status":"publish","type":"yycxsc","link":"https:\/\/www.zhaozhao123.cn\/php\/yycxsc\/1236.html","title":{"rendered":"PHP\u5224\u65ad\u67d0\u6570\u7ec4\u4e2d\u662f\u5426\u5b58\u5728\u6307\u5b9a\u952e\u540d\u7684\u65b9\u6cd5"},"content":{"rendered":"<p>\u5728PHP\u4e2d\uff0c\u5224\u65ad\u6570\u7ec4\u662f\u5426\u5305\u542b\u7279\u5b9a\u952e\u540d\u6709\u51e0\u79cd\u65b9\u6cd5\uff1a<\/p><h2 class=\"wp-block-heading\">1. \u4f7f\u7528 array_key_exists() \u51fd\u6570\uff08\u63a8\u8350\uff09<\/h2><pre class=\"wp-block-code\"><code>$zzw_array = [\n    'title' =&gt; '\u6587\u7ae0\u6807\u9898',\n    'featured_image' =&gt; 'image.jpg',\n    'content' =&gt; '\u5185\u5bb9'\n];\n\nif (array_key_exists('featured_image', $zzw_array)) {\n    echo \"\u5b58\u5728 featured_image \u952e\";\n} else {\n    echo \"\u4e0d\u5b58\u5728 featured_image \u952e\";\n}<\/code><\/pre><h2 class=\"wp-block-heading\">2. \u4f7f\u7528 isset() \u51fd\u6570<\/h2><pre class=\"wp-block-code\"><code>if (isset($array['featured_image'])) {\n    echo \"\u5b58\u5728 featured_image \u952e\";\n} else {\n    echo \"\u4e0d\u5b58\u5728 featured_image \u952e\";\n}<\/code><\/pre><h2 class=\"wp-block-heading\">3. \u4f7f\u7528 key_exists() \u51fd\u6570\uff08array_key_exists() \u7684\u522b\u540d\uff09<\/h2><pre class=\"wp-block-code\"><code>if (key_exists('featured_image', $zzw_array)) {\n    echo \"\u5b58\u5728 featured_image \u952e\";\n}<\/code><\/pre><h2 class=\"wp-block-heading\">\u4e3b\u8981\u533a\u522b<\/h2><ul class=\"wp-block-list\">\n<li><strong>array_key_exists()<\/strong>\uff1a\u4e25\u683c\u68c0\u67e5\u952e\u540d\u662f\u5426\u5b58\u5728\uff0c\u5373\u4f7f\u503c\u4e3a <code>null<\/code> \u4e5f\u4f1a\u8fd4\u56de <code>true<\/code><\/li>\n\n\n\n<li><strong>isset()<\/strong>\uff1a\u68c0\u67e5\u952e\u540d\u662f\u5426\u5b58\u5728\u4e14\u503c\u4e0d\u4e3a <code>null<\/code><\/li>\n<\/ul><h3 class=\"wp-block-heading\">\u793a\u4f8b\u5bf9\u6bd4\uff1a<\/h3><pre class=\"wp-block-code\"><code>$zzw_array = [\n    'featured_image' =&gt; null,\n    'title' =&gt; '\u6d4b\u8bd5'\n];\n\nvar_dump(array_key_exists('featured_image', $zzw_array)); \/\/ true\nvar_dump(isset($array['featured_image'])); \/\/ false<\/code><\/pre><h3 class=\"wp-block-heading\">\u5bf9\u4e8e\u591a\u7ef4\u6570\u7ec4\uff1a<\/h3><pre class=\"wp-block-code\"><code>$zzw_multiArray = [\n    'post' =&gt; [\n        'featured_image' =&gt; 'image.jpg',\n        'title' =&gt; '\u6807\u9898'\n    ]\n];\n\nif (array_key_exists('featured_image', $zzw_multiArray['post'])) {\n    echo \"\u5b58\u5728 featured_image \u952e\";\n}<\/code><\/pre><p><strong>\u63a8\u8350\u4f7f\u7528 <code>array_key_exists()<\/code><\/strong>\uff0c\u56e0\u4e3a\u5b83\u80fd\u51c6\u786e\u5224\u65ad\u952e\u540d\u662f\u5426\u5b58\u5728\uff0c\u4e0d\u53d7\u503c\u5185\u5bb9\u7684\u5f71\u54cd\u3002<\/p>","protected":false},"excerpt":{"rendered":"<p>\u5728PHP\u4e2d\uff0c\u5224\u65ad\u6570\u7ec4\u662f\u5426\u5305\u542b\u7279\u5b9a\u952e\u540d\u6709\u51e0\u79cd\u65b9\u6cd5\uff1a 1. \u4f7f\u7528 array_key_exists() \u51fd\u6570\uff08\u63a8\u8350\uff09 2. \u4f7f\u7528 isset() \u51fd\u6570 3. \u4f7f\u7528 key_exists() \u51fd\u6570\uff08array_key_exists() \u7684\u522b\u540d\uff09 \u4e3b\u8981\u533a\u522b \u793a\u4f8b\u5bf9\u6bd4\uff1a \u5bf9\u4e8e\u591a\u7ef4\u6570\u7ec4\uff1a \u63a8\u8350\u4f7f\u7528 array_key_exists..<\/p>\n","protected":false},"author":1,"featured_media":0,"menu_order":0,"template":"","meta":{"_acf_changed":true},"tags":[2051],"yycxsc2nav":[2052],"tuisongtax":[],"class_list":["post-1236","yycxsc","type-yycxsc","status-publish","hentry","tag-szczhs","yycxsc2nav-shuzu"],"acf":{"qian_art_seotitle":"","qian_art_seotitle_source":{"label":"SEO\u6807\u9898","type":"text","formatted_value":""},"qian_art_seokws":"PHP\u6570\u7ec4\u4e2d\u662f\u5426\u5b58\u5728\u6307\u5b9a\u952e\u540d","qian_art_seokws_source":{"label":"SEO\u5173\u952e\u8bcd","type":"text","formatted_value":"PHP\u6570\u7ec4\u4e2d\u662f\u5426\u5b58\u5728\u6307\u5b9a\u952e\u540d"},"qian_art_stzhong":"\u6570\u7ec4 \u2192 \u627e\u6307\u5b9a\u952e\u540d","qian_art_stzhong_source":{"label":"\u4e2d | \u77ed\u6807\u9898","type":"text","formatted_value":"\u6570\u7ec4 \u2192 \u627e\u6307\u5b9a\u952e\u540d"}},"_links":{"self":[{"href":"https:\/\/www.zhaozhao123.cn\/php\/wp-json\/wp\/v2\/yycxsc\/1236","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.zhaozhao123.cn\/php\/wp-json\/wp\/v2\/yycxsc"}],"about":[{"href":"https:\/\/www.zhaozhao123.cn\/php\/wp-json\/wp\/v2\/types\/yycxsc"}],"author":[{"embeddable":true,"href":"https:\/\/www.zhaozhao123.cn\/php\/wp-json\/wp\/v2\/users\/1"}],"wp:attachment":[{"href":"https:\/\/www.zhaozhao123.cn\/php\/wp-json\/wp\/v2\/media?parent=1236"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zhaozhao123.cn\/php\/wp-json\/wp\/v2\/tags?post=1236"},{"taxonomy":"yycxsc2nav","embeddable":true,"href":"https:\/\/www.zhaozhao123.cn\/php\/wp-json\/wp\/v2\/yycxsc2nav?post=1236"},{"taxonomy":"tuisongtax","embeddable":true,"href":"https:\/\/www.zhaozhao123.cn\/php\/wp-json\/wp\/v2\/tuisongtax?post=1236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}