{"id":30862,"date":"2023-12-20T18:48:25","date_gmt":"2023-03-06T15:08:03","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90php%e3%80%91%e8%bf%90%e7%ae%97%e7%ac%a6\/"},"modified":"2025-08-12T21:08:32","modified_gmt":"2025-08-12T13:08:32","slug":"%e3%80%90php%e3%80%91%e8%bf%90%e7%ae%97%e7%ac%a6","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90php%e3%80%91%e8%bf%90%e7%ae%97%e7%ac%a6\/","title":{"rendered":"\u3010PHP\u3011\u8fd0\u7b97\u7b26"},"content":{"rendered":"

\u8fd9\u7bc7\u6587\u7ae0\u662fPHP\u603b\u590d\u4e60 Advent Calendar 2016\u7684\u7b2c6\u5929\u6587\u7ae0\uff01
\n\u4eca\u5929\u6211\u5c06\u603b\u7ed3\u4e00\u4e0bPHP\u8fd0\u7b97\u7b26\u3002(\u02d9\u03c9\u02d9)\u0648 \uff78\uff9e\uff6f!<\/p>\n

\u5c3d\u7ba1\u5982\u6b64\uff0c\u4ec5\u4ec5\u5217\u4e3e\u6240\u6709\u5185\u5bb9\u5e76\u4e0d\u4f1a\u6709\u4ec0\u4e48\u533a\u522b\u4e8e\u6587\u4ef6\uff0c\u6240\u4ee5\u6211\u5c06\u4ecb\u7ecd\u4e00\u4e9b\u5e38\u7528\u7684\u5185\u5bb9\u548c\u9700\u8981\u6ce8\u610f\u7684\u8981\u70b9\u3002<\/p>\n

\u7b97\u5b50\u7684\u5b9a\u4e49\u662f\u4ec0\u4e48\uff1f<\/h2>\n

\u4ece\u4e00\u4e2a\u6216\u591a\u4e2a\u503c\uff08\u6216\u8005\u5728\u7f16\u7a0b\u672f\u8bed\u4e2d\u662f”\u8868\u8fbe\u5f0f”\uff09\u751f\u6210\u53e6\u4e00\u4e2a\u503c\uff08\u63a7\u5236\u7ed3\u6784\u662f\u4f5c\u4e3a\u8868\u8fbe\u5f0f\u7684\u5f62\u5f0f\uff09\u3002<\/p><\/blockquote>\n

\uff08\u6765\u81eaPHP\u624b\u518c\uff09<\/p>\n

\u8fd9\u8bdd\u8bf4\u51fa\u6765\u786e\u5b9e\u6709\u70b9\u96be\u554a\u3002\u6c57
\n\u53ef\u4ee5\u8bf4\uff0c\u5b83\u4f1a\u5bf9\u7c7b\u4f3c\u4e8e\u53d8\u91cf\u7684\u503c\u4ea7\u751f\u5f71\u54cd\u3002
\n\u6bd4\u5982 +\u3001=\u3001!\u7b49\u7b49\uff0c\u6211\u4eec\u7ecf\u5e38\u89c1\u5230\u8fd9\u4e9b\u7b26\u53f7\u3002<\/p>\n

\u6ca1\u6709\u5fc5\u8981\u8bb0\u4f4f\u6bcf\u4e2a\u8fd0\u7b97\u7b26\u7684\u540d\u79f0\uff0c\u56e0\u4e3a\u51e0\u4e4e\u6ca1\u6709\u6ca1\u6709\u8fd0\u7b97\u7b26\u7684\u7f16\u7a0b\u3002\u6240\u4ee5\uff0c\u8ba9\u6211\u4eec\u901a\u8fc7\u5b9e\u8df5\u6765\u719f\u6089\u5b83\uff0c\u800c\u4e0d\u662f\u5355\u7eaf\u5730\u5b66\u4e60\u5b83\u3002<\/p>\n

\u7b97\u5b50\u7684\u5206\u7c7b<\/h2>\n

\u4ee3\u6570\u8fd0\u7b97\u7b26<\/h3>\n

\u9664\u4e86\u7f16\u7a0b\u4e4b\u5916\uff0c\u8fd8\u7ecf\u5e38\u89c1\u5230\u7c7b\u4f3c\u4e8e\u6240\u8c13\u7684\u201c\u8ba1\u7b97\u201d\u7684\u4e1c\u897f\u3002<\/p>\n

$a + $b \u662f\u52a0\u6cd5\u8fd0\u7b97\u3002
\n$a – $b \u662f\u51cf\u6cd5\u8fd0\u7b97\u3002
\n$a * $b \u662f\u4e58\u6cd5\u8fd0\u7b97\uff08\u8bf7\u6ce8\u610f\u4e0d\u662f\u7528\u00d7\u8868\u793a\uff09\u3002
\n$a \/ $b \u662f\u9664\u6cd5\u8fd0\u7b97\u3002<\/p>\n

\u8fd9\u6837\u4e00\u6765\u3002
\n\u9664\u6cd5\u7684\u7ed3\u679c\u5c06\u8fd4\u56de\u6574\u6570\u6216\u6d6e\u70b9\u6570\uff0c\u56e0\u6b64\u9700\u8981\u6ce8\u610f\u5982\u4f55\u5904\u7406\u3002<\/p>\n

\u8fd0\u7b97\u7b26\u7684\u6548\u679c\uff1a\u8ba1\u7b97<\/p>\n

\u4ee3\u5165\u8fd0\u7b97\u7b26<\/h3>\n

\u6211\u4f1a\u7ee7\u7eed\u4f7f\u7528\u6b64\u524d\u7ecf\u5e38\u51fa\u73b0\u7684”=”\u3002
\n\u8fd9\u4e2a”=”\u8868\u793a\u7684\u662f\u5728\u6570\u5b66\u8868\u8fbe\u5f0f\u4e2d\u7684”\u7b49\u4e8e”\uff0c\u800c\u4e0d\u662f”\u8d4b\u503c”\u3002<\/p>\n

$b = 1;
\n$b\u7b49\u4e8e1\u3002<\/p>\n

$b \u4e0d\u7b49\u4e8e 1\uff0c\u800c\u662f\u8868\u793a\u5c06 1 \u201c\u8d4b\u503c\u7ed9\u201d $b\u3002<\/p>\n

\u8fd0\u7b97\u7b26\u7684\u6548\u679c\uff1a\u8d4b\u503c<\/p>\n

\u6bd4\u8f83\u8fd0\u7b97\u7b26<\/h3>\n

\u5bf9\u6bd4\u4e24\u4e2a\u503c\u5e76\u8fd4\u56de\u7ed3\u679c\u3002<\/p>\n

\u4f8b\u5982\uff0c\u5148\u524d\u7684=\u8868\u793a”\u8d4b\u503c”\uff0c\u800c===\u7528\u4e8e\u6bd4\u8f83”\u76f8\u7b49”\u3002
\n\u5f53$a === $b\u65f6\uff0c\u82e5$a\u4e0e$b\u76f8\u7b49\uff0c\u5219\u8fd4\u56de\u5e03\u5c14\u7c7b\u578b\u7684TRUE\uff1b\u82e5\u4e0d\u76f8\u7b49\uff0c\u5219\u8fd4\u56deFALSE\u3002<\/p>\n

\u8bf7\u6ce8\u610f\uff0c\u5728\u6bd4\u8f83\u64cd\u4f5c\u7b26\u4e2d\uff0c\u6709\u4e00\u79cd\u662f\u5c06\u7c7b\u578b\u8f6c\u6362\u540e\u6bd4\u8f83\u76f8\u7b49\u6027\u7684 ==\uff0c\u8fd8\u6709\u4e00\u79cd\u662f\u68c0\u67e5\u7c7b\u578b\u5e76\u6bd4\u8f83\u76f8\u7b49\u6027\u7684 ===\u3002<\/p>\n

<?php<\/span>\r\n\r\n$a<\/span> =<\/span> '1'<\/span>;<\/span> \/\/ string\u578b\uff08\u6587\u5b57\u5217\uff09<\/span>\r\n$b<\/span> =<\/span> 1<\/span>;<\/span> \/\/ integer\u578b\uff08\u6574\u6570\uff09<\/span>\r\n\r\necho<\/span> $a<\/span> ==<\/span> $b<\/span>;<\/span> \/\/ true<\/span>\r\necho<\/span> $a<\/span> ===<\/span> $b<\/span>;<\/span> \/\/ false<\/span>\r\n<\/code><\/pre>\n
\u5728\u8fd9\u91cc\u5b66\u4e60\u300c\u5f62\u6001\u300d\u4e5f\u5f88\u6709\u7528 ( \u5382\u02d9\u03c9\u02d9 )\u5382<\/p>\n
\u7ecf\u5e38\u4f7f\u7528\u7684\u6bd4\u8f83\u8fd0\u7b97\u7b26\u6709\uff0c<\/p>\n
!= \u4e0d\u7b49\u4e8e\uff08\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\u540e\u6bd4\u8f83\uff09
\n!== \u4e0d\u7b49\u4e8e\uff08\u540c\u65f6\u6bd4\u8f83\u7c7b\u578b\uff09
\n> \u5927\u4e8e
\n>= \u5927\u4e8e\u7b49\u4e8e<\/p>\n
\u5728\u4e2d\u6587\u4e2d\uff0c\u6709\u4ee5\u4e0b\u7b49\u7b49\u7684\u610f\u601d\u3002\u53e6\u5916\u8fd8\u4f1a\u5728\u4e0b\u6587\u4e2d\u63d0\u5230\uff0c\u4f46\u4e3b\u8981\u8868\u793a\u5426\u5b9a\u7684\u610f\u601d\u3002<\/p>\n
\u7b97\u5b50\u5bf9\u6bd4\u7684\u6548\u679c<\/p>\n
\u53e6\u5916\uff0c\u8fd8\u6709\u4e00\u79cd\u4e1c\u897f\u53eb\u505a\u4e09\u5143\u8fd0\u7b97\u7b26\u3002
\n\u6211\u4eec\u4f7f\u7528\u95ee\u53f7 : \u5b83\u3002<\/p>\n
\u5f0f1\uff1f\u5f0f2\uff1a\u5f0f3<\/p>\n
\u5bf9\u8868\u8fbe\u5f0f1\u8fdb\u884c\u8bc4\u4f30\uff0c\u5982\u679c\u4e3atrue\uff0c\u5219\u8fd4\u56de\u8868\u8fbe\u5f0f2\uff1b\u5982\u679c\u4e3afalse\uff0c\u5219\u8fd4\u56de\u8868\u8fbe\u5f0f3\u3002<\/p>\n
<?php<\/span>\r\n\r\n$user<\/span> =<\/span> 'Tom'<\/span>;<\/span>\r\n$greeting<\/span> =<\/span> isset<\/span>(<\/span>$user<\/span>)<\/span> ?<\/span> 'Hello, '<\/span>.<\/span> $user<\/span> :<\/span> 'Hello, guest'<\/span>;<\/span>\r\n\r\necho<\/span> $greeting<\/span>;<\/span> \/\/ 'Hello, Tom'<\/span>\r\n<\/code><\/pre>\n
\u9996\u5148\uff0c\u5bf9isset($user)\u8fdb\u884c\u8bc4\u4f30\uff0c\u7ed3\u679c\u4e3atrue\uff0c\u56e0\u6b64\u8fd4\u56de\u8868\u8fbe\u5f0f2\u3002\uff08\u5c06\u8fd4\u56de\u503c\u8d4b\u7ed9$greeting\uff09<\/p>\n
\u6b64\u5916\uff0c\u5982\u679c\u5f0f2\u4e0e\u5f0f1\u53d6\u76f8\u540c\u7684\u503c\uff0c\u53ef\u4ee5\u7701\u7565\u3002<\/p>\n
<?php<\/span>\r\n\r\n$user<\/span> =<\/span> [<\/span>'id'<\/span> =><\/span> 1<\/span>,<\/span> 'age'<\/span> =><\/span> 18<\/span>,<\/span> 'region'<\/span> =><\/span> 'Tokyo'<\/span>];<\/span>\r\n$name<\/span> =<\/span> $user<\/span>[<\/span>'name'<\/span>]<\/span> ?:<\/span> 'NONAME'<\/span>;<\/span>\r\n\r\necho<\/span> $name<\/span>;<\/span> \/\/ 'NONAME'<\/span>\r\n<\/code><\/pre>\n
\u4ecePHP7\u5f00\u59cb\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e2a\u79f0\u4e3a”null\u5408\u5e76\u8fd0\u7b97\u7b26”\u7684\u8fd0\u7b97\u7b26\u3002<\/p>\n
\u5f0f1\uff1a\u8bf7\u5c06\u4ee5\u4e0b\u5185\u5bb9\u7528\u4e2d\u6587\u8fdb\u884c\u672c\u5730\u5316\u6539\u5199\uff0c\u53ea\u9700\u8981\u4e00\u4e2a\u9009\u9879\uff1a<\/p>\n
\u5f0f2\uff1a\u8bf7\u5c06\u4e0b\u5217\u5185\u5bb9\u7528\u4e2d\u6587\u8fdb\u884c\u91cd\u65b0\u8868\u8ff0\uff0c\u53ea\u9700\u63d0\u4f9b\u4e00\u79cd\u9009\u62e9\uff1a<\/p>\n
\u5f53\u5b58\u5728\u5f0f1\u65f6\uff0c\u8fd4\u56de\u5f0f1\u7684\u503c\uff1b\u82e5\u4e0d\u5b58\u5728\uff0c\u5219\u8fd4\u56de\u5f0f2\u7684\u503c\u3002<\/p>\n
<?php<\/span>\r\n\r\n\/\/ \u4e0b\u8a18\u306f\u5168\u3066\u540c\u3058\u7d50\u679c\u3092\u8fd4\u3059\u51e6\u7406<\/span>\r\nif<\/span> (<\/span>isset<\/span>(<\/span>$name<\/span>))<\/span> {<\/span>\r\n    $user<\/span>[<\/span>'name'<\/span>]<\/span> =<\/span> $name<\/span>;<\/span>\r\n}<\/span> else<\/span> {<\/span>\r\n    $user<\/span>[<\/span>'name'<\/span>]<\/span> =<\/span> 'NONAME'<\/span>;<\/span>\r\n}<\/span>\r\n\r\n$user<\/span>[<\/span>'name'<\/span>]<\/span> =<\/span> isset<\/span>(<\/span>$name<\/span>)<\/span> ?<\/span> $name<\/span> :<\/span> 'NONAME'<\/span>;<\/span>\r\n$user<\/span>[<\/span>'name'<\/span>]<\/span> =<\/span> $name<\/span> ??<\/span> 'NONAME'<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u56e0\u4e3a\u53ef\u4ee5\u5728\u4e00\u884c\u4e2d\u7b80\u6d01\u5730\u5199\u51fa\u6765\uff0c\u6240\u4ee5\u7ecf\u5e38\u4f7f\u7528\u7a7a\u5408\u5e76\u8fd0\u7b97\u7b26\uff01<\/p>\n
\u903b\u8f91\u8fd0\u7b97\u7b26<\/h3>\n
\u53ef\u4ee5\u901a\u8fc7\u7ec4\u5408\u6761\u4ef6\u8bed\u53e5\u8fdb\u884c\u8bc4\u4f30\u3002<\/p>\n
1&&2<\/p>\n
\u7531\u4e8e\u4e0a\u8ff0\u7684&&\u8868\u793a”\u4e14”\uff0c\u6240\u4ee5\u5f53”\u8868\u8fbe\u5f0f1\u4e3a\u771f\u4e14\u8868\u8fbe\u5f0f2\u4e3a\u771f”\u65f6\u8fd4\u56de\u771f\u3002<\/p>\n
1. \u7b2c\u4e00\u4e2a\u516c\u5f0f\u548c\u7b2c\u4e8c\u4e2a\u516c\u5f0f
\n2. \u516c\u5f0f1\u548c\u516c\u5f0f2<\/p>\n
\u4e0a\u8ff0\u7684\u201c\u4e14\u201d\u4e0e&&\u90fd\u8868\u793a\u201c\u5e76\u4e14\u201d\uff0c\u4f46\u5b83\u4eec\u7684\u4f18\u5148\u7ea7\u4e0d\u540c\u3002
\n\u540c\u6837\u5730\uff0c\u8868\u793a\u201c\u6216\u8005\u201d\u7684\u201c\u6216\u201d\u548c||\u7684\u4f18\u5148\u7ea7\u4e5f\u4e0d\u540c\uff0c\u8bf7\u6ce8\u610f\u3002<\/p>\n
\u7531\u4e8e\u4f18\u5148\u7ea7\u7684\u5173\u7cfb\uff0c\u6240\u4ee5\u5e94\u4f18\u5148\u8003\u8651\u6216\u9009\u62e9 << \u548c << || << &&\u3002<\/p>\n
\u5982\u679c\uff08\u5f0f1 \u4e14 \u5f0f2 \u6216 \u5f0f3 \u6216 \u5f0f4\uff09{ \u30fb\u30fb\u30fb<\/p>\n
\u5982\u679c\u6709\u8fd9\u6837\u7684\u6761\u4ef6\u7684\u8bdd\uff0c<\/p>\n
\u2460 \u5f0f1\u548c\u5f0f2
\n\u2461 \u5f0f1\u6216\u5f0f3
\n\u2462 \u5f0f2\u6216\u5f0f4<\/p>\n
\u5c06\u6309\u7167\u8fd9\u4e2a\u987a\u5e8f\u8fdb\u884c\u8ba1\u7b97\u3002<\/p>\n
\u6587\u672c\u4e32\u64cd\u4f5c\u7b26<\/h3>\n
\u4f7f\u7528.\u6765\u64cd\u4f5c\u5b57\u7b26\u4e32\u3002<\/p>\n
<?php<\/span>\r\n\r\n$greeting<\/span> =<\/span> 'Hello, '<\/span>;<\/span>\r\n$message<\/span> =<\/span> $greeting<\/span> .<\/span> 'Tom!'<\/span>;<\/span>\r\n\r\necho<\/span> $message<\/span>;<\/span> \/\/ 'Hello, Tom!'<\/span>\r\n<\/code><\/pre>\n
\u5f53\u5c06\u5b57\u7b26\u4e32\u7528\u201c.\u201d\u8fde\u63a5\u65f6\uff0c\u5b83\u4eec\u4f1a\u5408\u5e76\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002<\/p>\n
<?php<\/span>\r\n\r\n$greeting<\/span> =<\/span> 'Hello, '<\/span>;<\/span>\r\n$greeting<\/span> .<\/span>=<\/span> 'Tom!'<\/span>;<\/span>\r\n\r\necho<\/span> $greeting<\/span>;<\/span> \/\/ 'Hello, Tom!'<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528\u7b49\u53f7\u5c06\u53f3\u4fa7\u5b57\u7b26\u4e32\u8fde\u63a5\u5230\u5de6\u4fa7\u53d8\u91cf\u5e76\u8fdb\u884c\u8d4b\u503c\u3002<\/p>\n
\u603b\u7ed3<\/h2>\n
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\u8fd9\u7bc7\u6587\u7ae0\u662fPHP\u603b\u590d\u4e60 Advent Calendar 2016\u7684\u7b2c6\u5929\u6587\u7ae0\uff01 \u4eca\u5929\u6211\u5c06\u603b\u7ed3\u4e00\u4e0bPHP\u8fd0\u7b97\u7b26\u3002 […]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-30862","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"\n\u3010PHP\u3011\u8fd0\u7b97\u7b26 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8e\u3010PHP\u3011\u8fd0\u7b97\u7b26\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u3010php\u3011\u8fd0\u7b97\u7b26\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010PHP\u3011\u8fd0\u7b97\u7b26\" \/>\n<meta property=\"og:description\" content=\"\u5173\u4e8e\u3010PHP\u3011\u8fd0\u7b97\u7b26\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u3010php\u3011\u8fd0\u7b97\u7b26\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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