{"id":30256,"date":"2023-11-28T12:23:38","date_gmt":"2022-09-17T03:32:12","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/php%e6%98%af%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d%ef%bc%9f\/"},"modified":"2025-08-12T18:19:38","modified_gmt":"2025-08-12T10:19:38","slug":"php%e6%98%af%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/php%e6%98%af%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d%ef%bc%9f\/","title":{"rendered":"PHP\u662f\u4ec0\u4e48\u610f\u601d\uff1f"},"content":{"rendered":"

\u5728\u7ecf\u9a8c\u8fd8\u4e0d\u591f\u4e30\u5bcc\u7684\u65f6\u5019\u6240\u601d\u8003\u7684\u4e8b\u60c5\u3002<\/h1>\n

\u8fd9\u53e5\u8bdd\u7684\u4e2d\u6587\u7ffb\u8bd1\u662f\u4ec0\u4e48\uff1f<\/p>\n

\u5f53\u6211\u5728\u73b0\u573a\u7ecf\u9a8c\u7ea6\u4e09\u4e2a\u6708\u5de6\u53f3\u65f6\uff0c\u7b2c\u4e00\u6b21\u89c1\u5230\u4ee5\u4e0b\u7684\u5904\u7406\u65b9\u5f0f\u65f6\uff0c\u6211\u5f88\u7591\u60d1\u5b83\u5230\u5e95\u662f\u4ec0\u4e48\u5904\u7406\uff1f\u4e3a\u4e86\u5e2e\u52a9\u90a3\u4e9b\u6709\u7c7b\u4f3c\u56f0\u60d1\u7684\u4eba\uff0c\u6211\u5199\u4e86\u8fd9\u7bc7\u6587\u7ae0\u3002<\/p>\n

$hoge = $a ?? null\r\n<\/code><\/pre>\n
\u6211\u77e5\u9053\u6709\u7c7b\u4f3c\u4e8e\u4e0b\u9762\u7684\u4e09\u5143\u8fd0\u7b97\u7b26\uff0c\u4f46”??”\u53ef\u80fd\u5bf9\u8bb8\u591a\u4eba\u6765\u8bf4\u5e76\u4e0d\u5e38\u89c1…<\/p>\n
$a = 1;\r\n$b = 2;\r\n\r\n$max = $a > $b ? $a : $b;\r\necho $max;\r\n<\/code><\/pre>\n
\u5b9f\u884c\u7d50\u679c\r\n2\r\n<\/code><\/pre>\n
\u5f97\u51fa\u7ed3\u8bba<\/h1>\n
$hoge = $a ?? null\r\n<\/code><\/pre>\n
\u8fd9\u6bb5\u4ee3\u7801\u6267\u884c\u4e86\u4e0e\u4e0b\u9762\u7684\u5904\u7406\u76f8\u540c\u7684\u64cd\u4f5c\u3002
\n\u5982\u679c\u5b58\u5728a\u7684\u503c\uff0c\u5219\u5c06a\u7684\u503c\u8d4b\u7ed9\u5b83\uff0c\u5426\u5219\u5c06\u4f1a\u662fnull\u3002<\/p>\n
if ($a) {\r\n    $hoge = $a;\r\n} else {\r\n    $hoge = null;\r\n}\r\n<\/code><\/pre>\n
\u5e0c\u671b\u8fd9\u7bc7\u7b80\u77ed\u7684\u6587\u7ae0\u80fd\u5bf9\u5927\u5bb6\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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