{"id":27513,"date":"2024-11-24T13:28:39","date_gmt":"2024-11-24T05:28:39","guid":{"rendered":"https:\/\/fwq.ai\/blog\/27513\/"},"modified":"2024-11-24T13:28:39","modified_gmt":"2024-11-24T05:28:39","slug":"php%e4%b8%ad%e5%ae%9a%e4%b9%89%e5%b8%b8%e9%87%8f%e7%9a%84%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/27513\/","title":{"rendered":"php\u4e2d\u5b9a\u4e49\u5e38\u91cf\u7684\u51fd\u6570"},"content":{"rendered":"<blockquote><p>\n  php \u4e2d\u5b9a\u4e49\u5e38\u91cf\u7684\u51fd\u6570\u662f define()\uff0c\u5b83\u5141\u8bb8\u7528\u6307\u5b9a\u7684\u540d\u79f0\u548c\u503c\u521b\u5efa\u5e38\u91cf\u3002\u5e38\u91cf\u4e00\u65e6\u5b9a\u4e49\uff0c\u5c31\u4e0d\u80fd\u88ab\u91cd\u65b0\u5b9a\u4e49\u6216\u53d6\u6d88\u5b9a\u4e49\uff0c\u5e76\u4e14\u5fc5\u987b\u662f\u6709\u6548\u7684 php \u6807\u8bc6\u7b26\uff08\u4ee5\u5b57\u6bcd\u6216\u4e0b\u5212\u7ebf\u5f00\u5934\uff0c\u533a\u5206\u5927\u5c0f\u5199\uff09\uff0c\u4f46\u53ef\u4ee5\u901a\u8fc7 $case_insensitive \u53c2\u6570\u6307\u5b9a\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u3002\u5e38\u91cf\u503c\u53ef\u4ee5\u662f\u4efb\u4f55 php \u6570\u636e\u7c7b\u578b\uff0c\u5e76\u53ef\u4ee5\u901a\u8fc7\u5176\u540d\u79f0\u8fdb\u884c\u8bbf\u95ee\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/11\/2024111100484168596.jpg\" class=\"aligncenter\" title=\"php\u4e2d\u5b9a\u4e49\u5e38\u91cf\u7684\u51fd\u6570\u63d2\u56fe\" alt=\"php\u4e2d\u5b9a\u4e49\u5e38\u91cf\u7684\u51fd\u6570\u63d2\u56fe\" \/><\/p>\n<p><strong>PHP \u4e2d\u5b9a\u4e49\u5e38\u91cf\u7684\u51fd\u6570<\/strong><\/p>\n<p>PHP \u4e2d\u5b9a\u4e49\u5e38\u91cf\u7684\u51fd\u6570\u662f define()\u3002<\/p>\n<p>define() \u51fd\u6570\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre>define(string $name, mixed $value, bool $case_insensitive = false) : bool<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5176\u4e2d\uff1a<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<ul>\n<li>$name\uff1a\u8981\u5b9a\u4e49\u7684\u5e38\u91cf\u7684\u540d\u79f0\u3002<\/li>\n<li>$value\uff1a\u5e38\u91cf\u7684\u503c\u3002<\/li>\n<li>$case_insensitive\uff08\u53ef\u9009\uff09\uff1a\u6307\u5b9a\u5e38\u91cf\u540d\u79f0\u662f\u5426\u533a\u5206\u5927\u5c0f\u5199\u3002\u9ed8\u8ba4\u4e3a false\uff0c\u8868\u793a\u533a\u5206\u5927\u5c0f\u5199\u3002<\/li>\n<\/ul>\n<p><strong>\u5b9a\u4e49\u5e38\u91cf<\/strong><\/p>\n<p>\u8981\u5b9a\u4e49\u4e00\u4e2a\u5e38\u91cf\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a<\/p>\n<pre>define('CONSTANT_NAME', 'Constant value');<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre>define('PI', 3.14159);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u8fd9\u5c06\u5b9a\u4e49\u4e00\u4e2a\u540d\u4e3a PI \u7684\u5e38\u91cf\uff0c\u5176\u503c\u4e3a 3.14159\u3002<\/p>\n<p><strong>\u5e38\u91cf\u540d\u79f0<\/strong><\/p>\n<p>\u5e38\u91cf\u540d\u79f0\u5fc5\u987b\u4e3a\u6709\u6548\u7684 PHP \u6807\u8bc6\u7b26\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>\u53ea\u80fd\u5305\u542b\u5b57\u6bcd\u3001\u6570\u5b57\u548c\u4e0b\u5212\u7ebf<\/li>\n<li>\u5fc5\u987b\u4ee5\u5b57\u6bcd\u6216\u4e0b\u5212\u7ebf\u5f00\u5934<\/li>\n<li>\u533a\u5206\u5927\u5c0f\u5199\uff08\u9664\u975e\u5728 define() \u51fd\u6570\u4e2d\u6307\u5b9a $case_insensitive \u4e3a true\uff09<\/li>\n<li>\u4e0d\u80fd\u662f\u4fdd\u7559\u5b57<\/li>\n<\/ul>\n<p><strong>\u5e38\u91cf\u503c<\/strong><\/p>\n<p>\u5e38\u91cf\u503c\u53ef\u4ee5\u662f\u4efb\u4f55 PHP \u6570\u636e\u7c7b\u578b\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>\u5b57\u7b26\u4e32<\/li>\n<li>\u6574\u6570<\/li>\n<li>\u6d6e\u70b9\u6570<\/li>\n<li>\u5e03\u5c14\u503c<\/li>\n<li>\u6570\u7ec4<\/li>\n<li>\u5bf9\u8c61<\/li>\n<\/ul>\n<p><strong>\u4f7f\u7528\u5e38\u91cf<\/strong><\/p>\n<p>\u5b9a\u4e49\u7684\u5e38\u91cf\u53ef\u4ee5\u901a\u8fc7\u5176\u540d\u79f0\u8bbf\u95ee\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>echo PI; \/\/ \u8f93\u51fa 3.14159<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u6ce8\u610f\u4e8b\u9879<\/strong><\/p>\n<ul>\n<li>\u5e38\u91cf\u4e00\u65e6\u5b9a\u4e49\uff0c\u5c31\u4e0d\u80fd\u88ab\u91cd\u65b0\u5b9a\u4e49\u6216\u53d6\u6d88\u5b9a\u4e49\u3002<\/li>\n<li>\u5e38\u91cf\u4e0d\u80fd\u5728\u7f16\u8bd1\u65f6\u4f7f\u7528\u3002<\/li>\n<li>\u5b9a\u4e49\u5e38\u91cf\u65f6\uff0c\u4e0d\u5e94\u4f7f\u7528\u7f8e\u5143\u7b26\u53f7 ($)\uff0c\u56e0\u4e3a\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e0e\u53d8\u91cf\u51b2\u7a81\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662fphp\u4e2d\u5b9a\u4e49\u5e38\u91cf\u7684\u51fd\u6570\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>php \u4e2d\u5b9a\u4e49\u5e38\u91cf\u7684\u51fd\u6570\u662f define()\uff0c\u5b83\u5141\u8bb8\u7528\u6307\u5b9a\u7684\u540d\u79f0\u548c\u503c\u521b\u5efa\u5e38\u91cf\u3002\u5e38\u91cf\u4e00\u65e6\u5b9a\u4e49\uff0c\u5c31\u4e0d\u80fd\u88ab\u91cd\u65b0\u5b9a\u4e49\u6216\u53d6\u6d88\u5b9a\u4e49\uff0c\u5e76\u4e14\u5fc5\u987b\u662f\u6709\u6548\u7684 php \u6807\u8bc6\u7b26\uff08\u4ee5\u5b57\u6bcd\u6216\u4e0b\u5212\u7ebf\u5f00\u5934\uff0c\u533a\u5206\u5927\u5c0f\u5199\uff09\uff0c\u4f46\u53ef\u4ee5\u901a\u8fc7 $case_insensitive \u53c2\u6570\u6307\u5b9a\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u3002\u5e38\u91cf\u503c\u53ef\u4ee5\u662f\u4efb\u4f55 php \u6570\u636e\u7c7b\u578b\uff0c\u5e76\u53ef\u4ee5\u901a\u8fc7\u5176\u540d\u79f0\u8fdb\u884c\u8bbf\u95ee\u3002 PHP \u4e2d\u5b9a\u4e49\u5e38\u91cf\u7684\u51fd\u6570 PHP \u4e2d\u5b9a\u4e49\u5e38\u91cf\u7684\u51fd\u6570\u662f define()\u3002 define() \u51fd\u6570\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a define(string $name, mixed $value, bool $case_insensitive = false) : bool \u767b\u5f55\u540e\u590d\u5236 \u5176\u4e2d\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b $name\uff1a\u8981\u5b9a\u4e49\u7684\u5e38\u91cf\u7684\u540d\u79f0\u3002 $value\uff1a\u5e38\u91cf\u7684\u503c\u3002 $case_insensitive\uff08\u53ef\u9009\uff09\uff1a\u6307\u5b9a\u5e38\u91cf\u540d\u79f0\u662f\u5426\u533a\u5206\u5927\u5c0f\u5199\u3002\u9ed8\u8ba4\u4e3a false\uff0c\u8868\u793a\u533a\u5206\u5927\u5c0f\u5199\u3002 \u5b9a\u4e49\u5e38\u91cf \u8981\u5b9a\u4e49\u4e00\u4e2a\u5e38\u91cf\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a define(&#8216;CONSTANT_NAME&#8217;, &#8216;Constant value&#8217;); \u767b\u5f55\u540e\u590d\u5236 \u4f8b\u5982\uff1a define(&#8216;PI&#8217;, 3.14159); \u767b\u5f55\u540e\u590d\u5236 \u8fd9\u5c06\u5b9a\u4e49\u4e00\u4e2a\u540d\u4e3a PI \u7684\u5e38\u91cf\uff0c\u5176\u503c\u4e3a 3.14159\u3002 \u5e38\u91cf\u540d\u79f0 \u5e38\u91cf\u540d\u79f0\u5fc5\u987b\u4e3a\u6709\u6548\u7684 PHP \u6807\u8bc6\u7b26\uff0c\u4f8b\u5982\uff1a \u53ea\u80fd\u5305\u542b\u5b57\u6bcd\u3001\u6570\u5b57\u548c\u4e0b\u5212\u7ebf \u5fc5\u987b\u4ee5\u5b57\u6bcd\u6216\u4e0b\u5212\u7ebf\u5f00\u5934 \u533a\u5206\u5927\u5c0f\u5199\uff08\u9664\u975e\u5728 define() [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-27513","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/27513","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=27513"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/27513\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=27513"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=27513"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=27513"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}