{"id":30370,"date":"2022-07-27T10:18:34","date_gmt":"2023-08-29T17:34:22","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/php%e7%9a%84null\/"},"modified":"2025-08-12T18:50:51","modified_gmt":"2025-08-12T10:50:51","slug":"php%e7%9a%84null","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/php%e7%9a%84null\/","title":{"rendered":"PHP\u7684null"},"content":{"rendered":"<p>\u55ef\uff0c\u7a0d\u5fae\u6709\u70b9\u3001\u4e0d\uff0c\u5176\u5b9e\u662f\u76f8\u5f53\u65e0\u5173\u7d27\u8981\u7684\u4e8b\u60c5\uff0c\u4f46\u662f\u6211\u88abnull\u5413\u5230\u4e86\u3002<br \/>\n\u4ee5\u4e0b\u54ea\u4e9b\u9009\u9879\u5728is_null()\u4e2d\u8fd4\u56detrue\u5462\uff1f<\/p>\n<pre class=\"post-pre\"><code><span class=\"nv\">$null1<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">null<\/span><span class=\"p\">;<\/span>\r\n<span class=\"nv\">$null2<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">Null<\/span><span class=\"p\">;<\/span>\r\n<span class=\"nv\">$null3<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">NULL<\/span><span class=\"p\">;<\/span>\r\n<span class=\"nv\">$null4<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">nUll<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<p>\u56de\u7b54\uff1a\u5168\u90e8\u7684\u610f\u601d\u662f\u6240\u6709\u7684\u3002<\/p>\n<p>PHP\u4e2d\u7684null\u4e0d\u533a\u5206\u5927\u5c0f\u5199\uff01\uff01\u6211\u4e0d\u77e5\u9053\u5462\u3002\u3002\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u55ef\uff0c\u7a0d\u5fae\u6709\u70b9\u3001\u4e0d\uff0c\u5176\u5b9e\u662f\u76f8\u5f53\u65e0\u5173\u7d27\u8981\u7684\u4e8b\u60c5\uff0c\u4f46\u662f\u6211\u88abnull\u5413\u5230\u4e86\u3002 \u4ee5\u4e0b\u54ea\u4e9b\u9009\u9879\u5728is_null()\u4e2d\u8fd4\u56det [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-30370","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) - 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