{"id":183522,"date":"2024-05-08T21:47:22","date_gmt":"2024-05-08T13:47:22","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/183522.html"},"modified":"2024-05-08T21:47:25","modified_gmt":"2024-05-08T13:47:25","slug":"php%e4%b8%ad%e5%b9%b6%e4%b8%94%e6%80%8e%e4%b9%88%e5%86%99","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/183522.html","title":{"rendered":"php\u4e2d\u5e76\u4e14\u600e\u4e48\u5199"},"content":{"rendered":"

\"php\u4e2d\u5e76\u4e14\u600e\u4e48\u5199\"<\/p>\n

PHP \u4e2d\u201c\u5e76\u4e14\u201d\u7684\u903b\u8f91\u8fd0\u7b97\u53ef\u4ee5\u4f7f\u7528\u903b\u8f91\u8fd0\u7b97\u7b26 &&<\/code> \u6216\u5173\u952e\u5b57 and<\/code> \u6765\u5b9e\u73b0\u3002\u5f53\u9700\u8981\u5bf9\u4e24\u4e2a\u6216\u591a\u4e2a\u6761\u4ef6\u8fdb\u884c\u540c\u65f6\u5224\u65ad\u65f6\uff0c\u53ea\u6709\u6240\u6709\u6761\u4ef6\u90fd\u4e3a true<\/code> \u65f6\uff0c\u6574\u4e2a\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\u624d\u4f1a\u662f true<\/code>\uff0c\u5426\u5219\u7ed3\u679c\u4e3a false<\/code>\u3002\u5728\u4f7f\u7528\u65f6\uff0c\u901a\u5e38\u5c06\u9700\u8981\u540c\u65f6\u6ee1\u8db3\u7684\u6761\u4ef6\u653e\u5728 &&<\/code> \u6216 and<\/code> \u7684\u4e24\u4fa7\uff0c\u4f8b\u5982\uff1a$condition1 && $condition2<\/code> \u8868\u793a $condition1<\/code> \u4ee5\u53ca $condition2<\/code> \u90fd\u4e3a true<\/code> \u65f6\uff0c\u6574\u4e2a\u8868\u8fbe\u5f0f\u624d\u4e3a true<\/code>\u3002<\/p>\n<\/p>\n

\u5728\u6761\u4ef6\u8bed\u53e5\u4e2d\u7684\u5e94\u7528\u662fPHP\u4e2d\u201c\u5e76\u4e14\u201d\u7684\u5e38\u89c1\u7528\u9014\u3002<\/strong> \u4f8b\u5982\uff0c\u5047\u5b9a\u6211\u4eec\u9700\u8981\u68c0\u67e5\u7528\u6237\u8f93\u5165\u7684\u7528\u6237\u540d\u548c\u5bc6\u7801\u662f\u5426\u6b63\u786e\uff0c\u5c31\u53ef\u4ee5\u7528 &&<\/code> \u8fd0\u7b97\u7b26\u5c06\u4e24\u4e2a\u72ec\u7acb\u7684\u6761\u4ef6\u8bed\u53e5\u8fde\u63a5\u8d77\u6765\uff1a<\/p>\n<\/p>\n

$username = 'user';<\/p>\n
$password = 'pass';<\/p>\n
if ($username == 'admin' && $password == 'secret') {<\/p>\n
    \/\/ \u5982\u679c\u7528\u6237\u540d\u662f 'admin' \u5e76\u4e14\u5bc6\u7801\u662f 'secret'\uff0c\u5219\u767b\u5f55\u6210\u529f<\/p>\n
    echo 'Login successful.';<\/p>\n
} else {<\/p>\n
    \/\/ \u5982\u679c\u7528\u6237\u540d\u6216\u5bc6\u7801\u4e2d\u6709\u4efb\u4f55\u4e00\u4e2a\u4e0d\u6ee1\u8db3\u6761\u4ef6\uff0c\u767b\u5f55\u5931\u8d25<\/p>\n
    echo 'Login fAI<\/a>led.';<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e00\u3001PHP\u4e2d\u201c\u5e76\u4e14\u201d\u7684\u903b\u8f91\u8fd0\u7b97<\/p>\n<\/p>\n
PHP\u8bed\u8a00\u4e2d\uff0c\u5b9e\u73b0\u903b\u8f91\u201c\u5e76\u4e14\u201d\u64cd\u4f5c\uff0c\u9700\u8981\u4f7f\u7528\u5230\u903b\u8f91\u8fd0\u7b97\u7b26 &&<\/code> \u6216 and<\/code> \u3002\u5f53\u4e24\u4e2a\u6216\u66f4\u591a\u6761\u4ef6\u540c\u65f6\u6210\u7acb\u65f6\uff0c\u6211\u4eec\u624d\u5f97\u5230true<\/code>\u7684\u7ed3\u679c\u3002\u8fd9\u5728\u7f16\u7a0b\u5b9e\u8df5\u4e2d\u975e\u5e38\u6709\u7528\uff0c\u7279\u522b\u662f\u5728\u9700\u8981\u6839\u636e\u591a\u4e2a\u6761\u4ef6\u6765\u63a7\u5236\u7a0b\u5e8f\u6d41\u7a0b\u7684\u60c5\u51b5\u4e0b\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u7406\u89e3&&<\/code>\u4e0eand<\/code>\u7684\u5dee\u5f02<\/p>\n<\/p>\n
\u5c3d\u7ba1 &&<\/code> \u548c and<\/code> \u90fd\u88ab\u7528\u4e8e\u8868\u793a\u903b\u8f91\u201c\u5e76\u4e14\u201d\uff0c\u4f46\u5b83\u4eec\u5728\u4f18\u5148\u7ea7\u4e0a\u5b58\u5728\u5dee\u5f02\u3002&&<\/code> \u7684\u4f18\u5148\u7ea7\u9ad8\u4e8e and<\/code>\u3002\u5728\u5b9e\u9645\u7f16\u7801\u4e2d\uff0c\u9664\u975e\u7279\u522b\u9700\u8981\uff0c\u5426\u5219\u63a8\u8350\u4f7f\u7528 &&<\/code> \u8fd0\u7b97\u7b26\u786e\u4fdd\u9884\u671f\u5185\u7684\u8fd0\u7b97\u4f18\u5148\u7ea7\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u590d\u6742\u6761\u4ef6\u7684\u903b\u8f91\u201c\u5e76\u4e14\u201d<\/p>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u4f1a\u9047\u5230\u66f4\u590d\u6742\u7684\u5224\u65ad\u6761\u4ef6\uff0c\u8fd9\u65f6\u5019\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u62ec\u53f7()<\/code>\u63a7\u5236\u6761\u4ef6\u7684\u4f18\u5148\u7ea7\uff0c\u5e76\u7ed3\u5408 &&<\/code> \u8fd0\u7b97\u7b26\u6765\u5b9e\u73b0\u590d\u6742\u7684\u201c\u5e76\u4e14\u201d\u903b\u8f91\u5173\u7cfb\u3002<\/p>\n<\/p>\n
\u56db\u3001\u5b9e\u4f8b\u5206\u6790<\/p>\n<\/p>\n
\u8ba9\u6211\u4eec\u901a\u8fc7\u5b9e\u9645\u4f8b\u5b50\u6df1\u5165\u7406\u89e3&&<\/code>\u8fd0\u7b97\u7b26\u5728PHP\u4e2d\u7684\u4f7f\u7528\u3002\u5047\u8bbe\u6211\u4eec\u6b63\u5728\u6784\u5efa\u4e00\u4e2a\u7b80\u5355\u7684\u767b\u5f55\u9a8c\u8bc1\u7cfb\u7edf\uff0c\u9700\u8981\u540c\u65f6\u9a8c\u8bc1\u7528\u6237\u540d\u548c\u5bc6\u7801\u662f\u5426\u6b63\u786e\u3002\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u4e24\u4e2a\u6761\u4ef6\u5fc5\u987b\u540c\u65f6\u88ab\u6ee1\u8db3\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u4f7f\u7528 &&<\/code> \u8fd0\u7b97\u7b26\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u5728\u5faa\u73af\u4e0e\u63a7\u5236\u7ed3\u6784\u4e2d\u4f7f\u7528\u201c\u5e76\u4e14\u201d<\/p>\n<\/p>\n
\u5728\u5faa\u73af\u4ee5\u53ca\u63a7\u5236\u7ed3\u6784\u4e2d\u4f7f\u7528\u201c\u5e76\u4e14\u201d\u64cd\u4f5c\u7b26\u53ef\u4ee5\u6709\u6548\u5730\u63a7\u5236\u7a0b\u5e8f\u7684\u6267\u884c\u6d41\u7a0b\u3002\u4f8b\u5982\uff0c\u5728while<\/code>\u5faa\u73af\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u8bbe\u5b9a\u4e00\u4e2a\u7efc\u5408\u4e86\u591a\u4e2a\u6761\u4ef6\u7684\u5faa\u73af\u9000\u51fa\u6761\u4ef6\u3002<\/p>\n<\/p>\n
\u516d\u3001\u6027\u80fd\u4f18\u5316\u6280\u5de7<\/p>\n<\/p>\n
\u5f53\u4f7f\u7528\u201c\u5e76\u4e14\u201d\u64cd\u4f5c\u7b26\u65f6\uff0c\u63a8\u8350\u5c06\u6700\u6709\u53ef\u80fd\u4e3a false<\/code> \u7684\u6761\u4ef6\u653e\u5728\u524d\u9762\uff0c\u8fd9\u6837\u53ef\u4ee5\u63d0\u524d\u9000\u51fa\u6761\u4ef6\u7684\u5224\u65ad\uff0c\u4ece\u800c\u63d0\u9ad8\u4ee3\u7801\u7684\u6548\u7387\u3002\u8fd9\u79cd\u6280\u672f\u88ab\u79f0\u4e3a\u201c\u77ed\u8def\u201d\u8fd0\u7b97\u3002<\/p>\n<\/p>\n
\u4e03\u3001\u6700\u4f73\u5b9e\u8df5\u4e0e\u5b89\u5168\u6027\u8003\u8651<\/p>\n<\/p>\n
\u5728\u4f7f\u7528\u201c\u5e76\u4e14\u201d\u903b\u8f91\u8fd0\u7b97\u8fc7\u7a0b\u4e2d\uff0c\u5e94\u5f53\u9075\u5faa\u7684\u6700\u4f73\u5b9e\u8df5\u610f\u5473\u7740\u4ee3\u7801\u4e0d\u4ec5\u8981\u6b63\u786e\uff0c\u8fd8\u8981\u6613\u4e8e\u7406\u89e3\u3002\u540c\u65f6\uff0c\u8003\u8651\u5230\u5b89\u5168\u6027\uff0c\u6211\u4eec\u5728\u5904\u7406\u4f8b\u5982\u7528\u6237\u8f93\u5165\u7b49\u53ef\u80fd\u4e0d\u5b89\u5168\u7684\u6570\u636e\u65f6\uff0c\u8981\u786e\u4fdd\u6240\u6709\u7684\u6761\u4ef6\u90fd\u5f97\u5230\u4e86\u9002\u5f53\u7684\u9a8c\u8bc1\u3002<\/p>\n<\/p>\n
\u516b\u3001\u7ed3\u8bed<\/p>\n<\/p>\n
\u7406\u89e3\u5e76\u719f\u7ec3\u5e94\u7528PHP\u4e2d\u7684\u201c\u5e76\u4e14\u201d\u8fd0\u7b97\u5bf9\u4e8e\u7f16\u5199\u903b\u8f91\u6b63\u786e\u4e14\u9ad8\u6548\u7684\u4ee3\u7801\u81f3\u5173\u91cd\u8981\u3002\u638c\u63e1 &&<\/code> \u548c and<\/code> \u7684\u4f7f\u7528\uff0c\u4ee5\u53ca\u5b83\u4eec\u4e4b\u95f4\u7684\u5dee\u5f02\uff0c\u80fd\u591f\u5e2e\u52a9\u5f00\u53d1\u8005\u66f4\u597d\u5730\u63a7\u5236\u7a0b\u5e8f\u7684\u903b\u8f91\u6d41\u7a0b\u5e76\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u8fd0\u884c\u6548\u7387\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
Q: \u5982\u4f55\u5728PHP\u4e2d\u4f7f\u7528\u903b\u8f91\u8fd0\u7b97\u7b26 "\u5e76\u4e14"\uff1f<\/strong><\/p>\n
A: \u5728PHP\u4e2d\uff0c\u4f7f\u7528\u903b\u8f91\u8fd0\u7b97\u7b26 "&&" \u6765\u8868\u793a "\u5e76\u4e14" \u7684\u6761\u4ef6\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u4eec\u60f3\u8981\u5224\u65ad\u4e24\u4e2a\u6761\u4ef6\u662f\u5426\u540c\u65f6\u6ee1\u8db3\uff0c\u53ef\u4ee5\u4f7f\u7528 "&&" \u8fd0\u7b97\u7b26\u8fde\u63a5\u8fd9\u4e24\u4e2a\u6761\u4ef6\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
if ($condition1 && $condition2) {\n  \/\/ \u5982\u679c $condition1 \u548c $condition2 \u540c\u65f6\u6ee1\u8db3\uff0c\u5219\u6267\u884c\u8fd9\u91cc\u7684\u4ee3\u7801\n  echo "\u4e24\u4e2a\u6761\u4ef6\u90fd\u6ee1\u8db3\uff01";\n} else {\n  \/\/ \u5982\u679c\u81f3\u5c11\u4e00\u4e2a\u6761\u4ef6\u4e0d\u6ee1\u8db3\uff0c\u5219\u6267\u884c\u8fd9\u91cc\u7684\u4ee3\u7801\n  echo "\u6761\u4ef6\u4e0d\u6ee1\u8db3\uff01";\n}\n<\/code><\/pre>\n
\u8bf7\u6ce8\u610f\uff0c\u4f7f\u7528 "&&" \u8fd0\u7b97\u7b26\u65f6\uff0c\u4e24\u4e2a\u6761\u4ef6\u90fd\u5fc5\u987b\u4e3a\u771f\uff08\u975e\u96f6\u503c\u6216\u975e\u7a7a\u5b57\u7b26\u4e32\uff09\u624d\u4f1a\u6267\u884c\u76f8\u5e94\u7684\u4ee3\u7801\u5757\u3002\u5426\u5219\uff0c\u5982\u679c\u4efb\u4e00\u6761\u4ef6\u4e3a\u5047\uff0c\u5219\u4f1a\u6267\u884c else \u5757\u4e2d\u7684\u4ee3\u7801\u3002<\/p>\n
Q: \u5728PHP\u4e2d\u5982\u4f55\u5224\u65ad\u591a\u4e2a\u6761\u4ef6\u540c\u65f6\u6210\u7acb\uff1f<\/strong><\/p>\n
A: \u5982\u679c\u60a8\u60f3\u8981\u5728PHP\u4e2d\u5224\u65ad\u591a\u4e2a\u6761\u4ef6\u662f\u5426\u540c\u65f6\u6ee1\u8db3\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u903b\u8f91\u8fd0\u7b97\u7b26 "&&"\uff08\u5e76\u4e14\uff09 \u6765\u8fde\u63a5\u5b83\u4eec\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u60a8\u6709\u591a\u4e2a\u6761\u4ef6 $condition1\u3001$condition2 \u548c $condition3\uff0c\u60a8\u53ef\u4ee5\u6309\u4ee5\u4e0b\u65b9\u5f0f\u7f16\u5199\u4ee3\u7801\uff1a<\/p>\n
if ($condition1 && $condition2 && $condition3) {\n  \/\/ \u5982\u679c\u6240\u6709\u6761\u4ef6\u90fd\u6ee1\u8db3\uff0c\u5219\u6267\u884c\u8fd9\u91cc\u7684\u4ee3\u7801\n  echo "\u6240\u6709\u6761\u4ef6\u90fd\u6ee1\u8db3\uff01";\n} else {\n  \/\/ \u5982\u679c\u81f3\u5c11\u4e00\u4e2a\u6761\u4ef6\u4e0d\u6ee1\u8db3\uff0c\u5219\u6267\u884c\u8fd9\u91cc\u7684\u4ee3\u7801\n  echo "\u81f3\u5c11\u4e00\u4e2a\u6761\u4ef6\u4e0d\u6ee1\u8db3\uff01";\n}\n<\/code><\/pre>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u5982\u679c\u6240\u6709\u6761\u4ef6\u90fd\u4e3a\u771f\uff08\u975e\u96f6\u503c\u6216\u975e\u7a7a\u5b57\u7b26\u4e32\uff09\uff0c\u5219\u4f1a\u6267\u884c if \u5757\u4e2d\u7684\u4ee3\u7801\u3002\u5982\u679c\u81f3\u5c11\u4e00\u4e2a\u6761\u4ef6\u4e3a\u5047\uff0c\u5219\u4f1a\u6267\u884c else \u5757\u4e2d\u7684\u4ee3\u7801\u3002<\/p>\n
Q: \u5728PHP\u8bed\u8a00\u4e2d\uff0c\u5982\u4f55\u4f7f\u7528\u903b\u8f91\u8fd0\u7b97\u7b26 "\u5e76\u4e14" \u8fde\u63a5\u591a\u4e2a\u6761\u4ef6\uff1f<\/strong><\/p>\n
A: PHP\u4e2d\u4f7f\u7528\u903b\u8f91\u8fd0\u7b97\u7b26 "&&" \u6765\u8868\u793a "\u5e76\u4e14" \u7684\u6761\u4ef6\u3002\u5982\u679c\u60a8\u9700\u8981\u8fde\u63a5\u591a\u4e2a\u6761\u4ef6\uff0c\u53ef\u4ee5\u4f7f\u7528 "&&" \u8fd0\u7b97\u7b26\u5c06\u5b83\u4eec\u7ec4\u5408\u8d77\u6765\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u60a8\u6709\u4e09\u4e2a\u6761\u4ef6 $condition1\u3001$condition2 \u548c $condition3\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u7f16\u5199\u4ee3\u7801\uff1a<\/p>\n
if ($condition1 && $condition2 && $condition3) {\n  \/\/ \u5982\u679c\u6240\u6709\u6761\u4ef6\u90fd\u6ee1\u8db3\uff0c\u5219\u6267\u884c\u8fd9\u91cc\u7684\u4ee3\u7801\n  echo "\u6240\u6709\u6761\u4ef6\u90fd\u6ee1\u8db3\uff01";\n} else {\n  \/\/ \u5982\u679c\u81f3\u5c11\u4e00\u4e2a\u6761\u4ef6\u4e0d\u6ee1\u8db3\uff0c\u5219\u6267\u884c\u8fd9\u91cc\u7684\u4ee3\u7801\n  echo "\u81f3\u5c11\u4e00\u4e2a\u6761\u4ef6\u4e0d\u6ee1\u8db3\uff01";\n}\n<\/code><\/pre>\n
\u5f53\u6240\u6709\u6761\u4ef6\u90fd\u4e3a\u771f\uff08\u975e\u96f6\u503c\u6216\u975e\u7a7a\u5b57\u7b26\u4e32\uff09\u65f6\uff0cif \u5757\u4e2d\u7684\u4ee3\u7801\u5c06\u88ab\u6267\u884c\u3002\u5982\u679c\u81f3\u5c11\u4e00\u4e2a\u6761\u4ef6\u4e3a\u5047\uff0c\u5219\u4f1a\u6267\u884c else \u5757\u4e2d\u7684\u4ee3\u7801\u3002\u4f7f\u7528 "&&" \u8fd0\u7b97\u7b26\u65f6\uff0c\u8bf7\u786e\u4fdd\u6240\u6709\u6761\u4ef6\u7684\u987a\u5e8f\u548c\u903b\u8f91\u5173\u7cfb\u7b26\u5408\u60a8\u7684\u9884\u671f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"PHP \u4e2d\u201c\u5e76\u4e14\u201d\u7684\u903b\u8f91\u8fd0\u7b97\u53ef\u4ee5\u4f7f\u7528\u903b\u8f91\u8fd0\u7b97\u7b26 && \u6216\u5173\u952e\u5b57 and \u6765\u5b9e\u73b0\u3002\u5f53\u9700\u8981\u5bf9\u4e24\u4e2a\u6216 […]","protected":false},"author":3,"featured_media":183525,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/183522"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=183522"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/183522\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/183525"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=183522"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=183522"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=183522"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}