{"id":30432,"date":"2022-11-14T15:42:52","date_gmt":"2023-07-19T19:32:21","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ephp%e5%b8%b8%e9%87%8f%e7%9a%84%e5%86%85%e5%ae%b9%e3%80%82\/"},"modified":"2025-08-12T19:09:11","modified_gmt":"2025-08-12T11:09:11","slug":"%e5%85%b3%e4%ba%8ephp%e5%b8%b8%e9%87%8f%e7%9a%84%e5%86%85%e5%ae%b9%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ephp%e5%b8%b8%e9%87%8f%e7%9a%84%e5%86%85%e5%ae%b9%e3%80%82\/","title":{"rendered":"\u5173\u4e8ePHP\u5e38\u91cf\u7684\u5185\u5bb9"},"content":{"rendered":"

\u4e3a\u4e86\u66f4\u65b0\u65e7\u77e5\u8bc6\uff0c\u6211\u6b63\u5728\u91cd\u65b0\u5b66\u4e60PHP\u3002<\/p>\n

\u5728\u6211\u4e0d\u77e5\u9053\u7684\u60c5\u51b5\u4e0b\uff0c\u9664\u4e86define()\u5916\uff0c\u8fd8\u589e\u52a0\u4e86\u5176\u4ed6\u5e38\u91cf\u5b9a\u4e49\u7684\u65b9\u6cd5\u3002<\/p>\n

PHP\u7684\u5e38\u91cf\u5b9a\u4e49\u6709\u4e24\u79cd\u65b9\u6cd5\u3002<\/h2>\n

\u4f7f\u7528define()\u51fd\u6570\u7684\u4e1c\u897f<\/h3>\n
define<\/span>(<\/span>\"FOO\"<\/span>,<\/span> 1<\/span>);<\/span>\r\n<\/code><\/pre>\n
2. \u4f7f\u7528const\u8bed\u6cd5\u7684\u4e1c\u897f<\/h3>\n
const<\/span> FOO<\/span> =<\/span> 1<\/span>;<\/span>\r\n<\/code><\/pre>\n
define()\u51fd\u6570\u548cconst\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h2>\n
\u5728 PHP5.3 \u4e2d\u5f15\u5165\u4e86 const \u8bed\u6cd5\u3002\u5728\u6b64\u4e4b\u524d\u7684\u7248\u672c\u4e2d\u4e0d\u53ef\u7528\u3002
\n\u5e76\u975e\u4ec5\u4ec5\u662f\u8bed\u6cd5\u7cd6\uff0c\u4f3c\u4e4e\u6709\u4e00\u4e9b\u533a\u522b\u3002<\/p>\n
1. \u53ef\u4ee5\u4f5c\u4e3a\u7c7b\u5e38\u91cf\u4f7f\u7528\u5417\uff1f ma?)<\/h3>\n
class<\/span> Hoge<\/span>\r\n{<\/span>\r\n    const<\/span> FOO<\/span> =<\/span> \"foo\"<\/span>;<\/span>     \/\/ <= OK<\/span>\r\n    define<\/span>(<\/span>\"BAR\"<\/span>,<\/span> \"bar\"<\/span>);<\/span>  \/\/ <= ERROR!!<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528const\u53ef\u4ee5\u5728\u7c7b\u5185\u5b9a\u4e49\u5e38\u91cf\u3002
\n\uff08\u5982\u679c\u5c1d\u8bd5\u5728\u7c7b\u5185\u4f7f\u7528define()\u6765\u5b9a\u4e49\u5e38\u91cf\uff0c\u5219\u4f1a\u51fa\u73b0\u9519\u8bef\uff09
\n\u4f7f\u7528const\u5728\u7c7b\u5185\u5b9a\u4e49\u7684\u5e38\u91cf\u88ab\u79f0\u4e3a\u7c7b\u5e38\u91cf\uff0c\u5e76\u5177\u6709\u516c\u5171\u8bbf\u95ee\u6743\u9650\u3002\uff08\u6362\u53e5\u8bdd\u8bf4\uff0c\u4e0d\u80fd\u6307\u5b9a\u8bbf\u95ee\u6743\u9650\uff09
\n\u5982\u679c\u8981\u4ece\u7c7b\u5916\u5f15\u7528\uff0c\u53ef\u4ee5\u4f7f\u7528\u201c\u7c7b\u540d::\u5e38\u91cf\u540d\u201d\u3002<\/p>\n
2. \u88ab\u547d\u540d\u7a7a\u95f4\u6240\u5f71\u54cd\u3002<\/h3>\n
\u4ee5const\u5173\u952e\u5b57\u5b9a\u4e49\u7684\u5e38\u91cf\u4f1a\u53d7\u5230\u547d\u540d\u7a7a\u95f4\u7684\u5f71\u54cd\u3002<\/p>\n
<?php<\/span>\r\nnamespace<\/span> Lib<\/span>;<\/span>\r\n\r\nconst<\/span> FOO<\/span> =<\/span> \"foo\"<\/span>;<\/span>\r\ndefine<\/span>(<\/span>\"BAR\"<\/span>,<\/span> \"bar\"<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u6211\u4eec\u8003\u8651\u7684\u8bdd\uff0c\u5e38\u6570FOO\u5c06\u4f4d\u4e8e\u547d\u540d\u7a7a\u95f4Lib\u7684\u5b50\u7ea7\uff0c\u800c\u5e38\u6570BAR\u5c06\u4e0d\u53d7\u547d\u540d\u7a7a\u95f4\u5f71\u54cd\u5e76\u59cb\u7ec8\u4e3a\u5168\u5c40\u53d8\u91cf\u3002\uff08\u6700\u8fd1\u7684PHP\u7248\u672c\u662f\u5426\u652f\u6301\u4f7f\u7528\u547d\u540d\u7a7a\u95f4\uff09<\/p>\n
<?php<\/span>\r\nrequire_once<\/span>(<\/span>\"lib.php\"<\/span>);<\/span>\r\n\r\necho<\/span> BAR<\/span> .<\/span> PHP_EOL<\/span>;<\/span>         \/\/ <= OK<\/span>\r\necho<\/span> \\<\/span>Lib\\FOO<\/span> .<\/span> PHP_EOL<\/span>;<\/span>    \/\/ <= OK<\/span>\r\necho<\/span> FOO<\/span> .<\/span> PHP_EOL<\/span>;<\/span>         \/\/ <= ERROR<\/span>\r\n<\/code><\/pre>\n
3. \u5728\u5b9a\u4e49\u65f6\uff0c\u65e0\u6cd5\u4f7f\u7528\u8868\u8fbe\u5f0f\u3002 (2014\u5e744\u670821\u65e5 \u8ffd\u52a0)<\/h3>\n
\u6839\u636e\u8bc4\u8bba\u4e2d\u6240\u6307\u51fa\u7684\uff0c\u5728\u5b9a\u4e49\u65f6\uff0c\u53ef\u80fd\u53ef\u4ee5\u5c06\u8868\u8fbe\u5f0f\u7528\u4f5c\u5e38\u91cf\u7684\u503c\u3002<\/p>\n
const<\/span> FOO<\/span> =<\/span> 1<\/span>+<\/span>2<\/span>;<\/span>      # <= ERROR<\/span>\r\ndefine<\/span>(<\/span>'FOO1'<\/span>,<\/span> 1<\/span>+<\/span>2<\/span>);<\/span>  # <= OK<\/span>\r\n<\/code><\/pre>\n
\u56e0\u4e3a\u6211\u6ca1\u6709\u627e\u5230\u6587\u6863\u4e2d\u5173\u4e8e\u53ef\u4f7f\u7528\u8868\u8fbe\u5f0f\u7684\u8bf4\u660e\uff0c\u6240\u4ee5\u6ca1\u6709\u610f\u8bc6\u5230\u8fd9\u4e00\u70b9\u3002<\/p>\n
\u5e94\u8be5\u9009\u62e9\u54ea\u4e00\u4e2a\uff1f<\/h2>\n
\u5982\u679c\u4f60\u4f7f\u7528PHP5.3\u6216\u66f4\u9ad8\u7248\u672c\uff0c\u53ef\u4ee5\u4f7f\u7528const\u5173\u952e\u5b57\uff0c\u5bf9\u5417\uff1f<\/p>\n","protected":false},"excerpt":{"rendered":"
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