{"id":948,"date":"2023-01-18T14:53:39","date_gmt":"2023-01-18T06:53:39","guid":{"rendered":"https:\/\/site.uugo.cf\/?p=948"},"modified":"2023-01-18T16:45:33","modified_gmt":"2023-01-18T08:45:33","slug":"php%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/site.uugo.cf\/?p=948","title":{"rendered":"PHP\u7b14\u8bb0"},"content":{"rendered":"\n

1\u3001PHP\u53d8\u91cf\u3001\u5e38\u91cf\u5927\u5c0f\u5199\u4e0d\u4e00\u6837\uff0c\u4ee5$\u5f00\u5934\uff0c\u6bcf\u53e5\u7ed3\u675f\u7b26\u53f7\u662f;<\/p>\n\n\n\n

\u5e38\u91cf\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u6807\u8bc6\u7b26\u3002\u5728\u811a\u672c\u6267\u884c\u671f\u95f4\u8be5\u503c\u4e0d\u80fd\u6539\u53d8\uff08\u9664\u4e86\u6240\u8c13\u7684\u9b54\u672f\u5e38\u91cf\uff0c\u4ed6\u4eec\u5176\u5b9e\u4e0d\u662f\u5e38\u91cf\uff09\u3002\u5e38\u91cf\u9ed8\u8ba4\u5927\u5c0f\u5199\u654f\u611f\u3002\u901a\u5e38\u5e38\u91cf\u6807\u8bc6\u7b26\u603b\u662f\u5927\u5199\u7684\u3002<\/p>\n\n\n\n

\u4e00\u3001\u5e38\u91cf\u548c\u53d8\u91cf\u6709\u5982\u4e0b\u4e0d\u540c<\/strong>\uff1a<\/p>\n\n\n\n

1\u3001\u5e38\u91cf\u524d\u9762\u6ca1\u6709\u7f8e\u5143\u7b26\u53f7($)<\/p>\n\n\n\n

2\u3001\u5e38\u91cf\u53ea\u80fd\u901a\u8fc7define()\u51fd\u6570\u5b9a\u4e49\uff0c\u800c\u4e0d\u80fd\u901a\u8fc7\u8d4b\u503c\u8bed\u53e5<\/p>\n\n\n\n

3\u3001\u5e38\u91cf\u53ef\u4ee5\u4e0d\u7528\u7406\u4f1a\u53d8\u91cf\u7684\u4f5c\u7528\u57df\u5728\u4efb\u4f55\u5730\u65b9\u5b9a\u4e49\u548c\u8bbf\u95ee<\/p>\n\n\n\n

4\u3001\u5e38\u91cf\u4e00\u65e6\u5b9a\u4e49\u5c31\u4e0d\u80fd\u91cd\u65b0\u5b9a\u4e49\u6216\u53d6\u6d88\u5b9a\u4e49<\/p>\n\n\n\n

5\u3001\u5e38\u91cf\u7684\u503c\u53ea\u80fd\u662f\u6807\u91cf\uff08boolean\u3001integer\u3001float\u548cstring\uff09<\/p>\n\n\n\n

\u4e8c\u3001<\/strong>const<\/strong>\u548cdefine\u7684\u533a\u522b<\/strong><\/p>\n\n\n\n

1\u3001const\u662f\u4e00\u4e2a\u8bed\u8a00\u7ed3\u6784\uff1bconst\u5b9a\u4e49\u7684\u5e38\u91cf\u662f\u5927\u5c0f\u5199\u654f\u611f\u3002\u800cdefine\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u53ef\u4ee5\u901a\u8fc7\u7b2c\u4e09\u4e2a\u53c2\u6570\u6765\u6307\u5b9a\u662f\u5426\u533a\u5206\u5927\u5c0f\u5199\u3002true\u8868\u793a\u5927\u5c0f\u5199\u4e0d\u654f\u611f\uff0c\u9ed8\u8ba4\u4e3afalse<\/p>\n\n\n\n

define(‘PI’, 3.14, true);<\/p>\n\n\n\n

2\u3001const\u7b80\u5355\u6613\u8bfb\uff0c\u7f16\u8bd1\u65f6\u8981\u6bd4define\u5feb\u5f88\u591a\u3002<\/p>\n\n\n\n

3\u3001const\u53ef\u5728\u7c7b\u4e2d\u4f7f\u7528\uff0c\u7528\u4e8e\u7c7b\u6210\u5458\u5e38\u91cf\u5b9a\u4e49(\u5728php5.3.0\u4ee5\u540e\uff0c\u53ef\u4ee5\u4f7f\u7528const\u5173\u952e\u5b57\u5728\u7c7b\u5b9a\u4e49\u7684\u5916\u90e8\u5b9a\u4e49\u5e38\u91cf)\uff0c\u5b9a\u4e49\u540e\u4e0d\u53ef\u4fee\u6539\uff0cconst\u5728\u7c7b\u5185\u5b9a\u4e49\u5e38\u91cf\uff0c\u5e76\u4e14const\u5fc5\u987b\u901a\u8fc7\u7c7b\u540d::\u53d8\u91cf\u540d\u6765\u8fdb\u884c\u8bbf\u95ee\uff1bdefine\u4e0d\u80fd\u5728\u7c7b\u4e2d\u4f7f\u7528\uff0c\u53ef\u7528\u4e8e\u5168\u5c40\u53d8\u91cf<\/strong><\/p>\n\n\n\n

4\u3001const\u662f\u5728\u7f16\u8bd1\u65f6\u5b9a\u4e49\uff0c\u56e0\u6b64\u5fc5\u987b\u5904\u4e8e\u6700\u9876\u7aef\u7684\u4f5c\u7528\u533a\u57df\uff0c\u4e0d\u80fd\u5728\u51fd\u6570\uff0c\u5faa\u73af\u53caif\u6761\u4ef6\u4e2d\u4f7f\u7528\uff1b\u800cdefine\u662f\u51fd\u6570\uff0c\u4e5f\u5c31\u662f\u80fd\u8c03\u7528\u51fd\u6570\u7684\u5730\u65b9\u90fd\u53ef\u4ee5\u4f7f\u7528<\/strong><\/p>\n\n\n\n

5\u3001const\u53ea\u80fd\u7528\u666e\u901a\u7684\u5e38\u91cf\u540d\uff0cdefine\u5e38\u91cf\u540d\u4e2d\u53ef\u4ee5\u6709\u8868\u8fbe\u5f0f<\/p>\n\n\n\n

6\u3001const\u5b9a\u4e49\u7684\u5e38\u91cf\u53ea\u80fd\u662f\u9759\u6001\u5e38\u91cf\uff0cdefine\u53ef\u4ee5\u662f\u4efb\u610f\u8868\u8fbe\u5f0f<\/p>\n\n\n\n

\u2460include\u548crequire\u4f5c\u7528\u53ca\u7528\u6cd5
<\/strong>
\u3000\u3000\u53ef\u4ee5\u51cf\u5c11\u4ee3\u7801\u7684\u91cd\u590d<\/p>\n\n\n\n

\u3000\u3000include(_once)\uff08”\u6587\u4ef6\u7684\u8def\u5f84”\uff09\u4e0erequire(_once)\uff08”\u6587\u4ef6\u7684\u8def\u5f84”\uff09<\/p>\n\n\n\n

\u2461\u7406\u89e3<\/strong><\/p>\n\n\n\n

\u3000\u3000\u8bf4\u767d\u4e86\uff0c\u5c31\u662f\u7528\u5305\u542b\u8fdb\u6765\u7684\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9 \u4ee3\u66ff include(_once),require(_once)\u90a3\u4e00\u884c<\/p>\n\n\n\n

\u2462\u6ce8\u610f<\/strong>\u3000\u3000<\/p>\n\n\n\n

\u3000\u3000include\/require \u5305\u542b\u8fdb\u6765\u7684\u6587\u4ef6\u5fc5\u987b\u8981\u52a0<?php ?>\u56e0\u4e3a\u5728\u5305\u542b\u65f6,\u9996\u5148\u7406\u89e3\u6587\u4ef6\u5185\u5bb9\u662f\u666e\u901a\u5b57\u7b26\u4e32,\u78b0\u5230<?php ?> \u6807\u7b7e\u65f6,\u624d\u53bb\u89e3\u91ca<\/p>\n\n\n\n

\u2463\u8def\u5f84

<\/strong>\u3000\u3000\u53ef\u4ee5\u7528\u7edd\u5bf9\u8def\u5f84\uff0c\u4e5f\u53ef\u4ee5\u7528\u76f8\u5bf9\u8def\u5f84\uff1bwindows\u4e0b\u6b63\u53cd\u659c\u7ebf\u90fd\u53ef\u4ee5\uff0clinux\u4e0b\u53ea\u8ba4\u6b63\u659c\u7ebf\uff0c\u6240\u4ee5\u6700\u597d\u7528\u6b63\u659c\u7ebf<\/p>\n\n\n\n

\u2464\u533a\u522b
<\/strong>
\u3000\u3000include\u662f\u5305\u542b\u7684\u610f\u601d\uff0c\u627e\u4e0d\u5230\u6587\u4ef6\u65f6\uff0c\u4f1a\u62a5warning\u7684\u9519\u8bef\uff0c\u7136\u540e\u7a0b\u5e8f\u7ee7\u7eed\u5f80\u4e0b\u6267\u884c<\/p>\n\n\n\n

\u3000\u3000require\u662f\u5fc5\u987b\u7684\u610f\u601d\uff0c\u627e\u4e0d\u5230\u6587\u4ef6\u65f6\uff0c\u4f1a\u62a5fatal error \uff08\u81f4\u547d\u9519\u8bef\uff09\uff0c\u7a0b\u5e8f\u505c\u6b62\u5f80\u4e0b\u6267\u884c<\/p>\n\n\n\n

\u3000\u3000\u52a0once\u540e\uff0c\u7cfb\u7edf\u4f1a\u8fdb\u884c\u5224\u65ad\uff0c\u5982\u679c\u5df2\u7ecf\u5305\u542b\uff0c\u5219\u4e0d\u4f1a\u518d\u5305\u542b\u7b2c\u4e8c\u6b21<\/p>\n\n\n\n

\u3000\u3000\u3000\u3000eg\uff1a\u6709\u4e00\u4e2aa.php\u6587\u4ef6 \u5185\u5bb9\u662f<?php $a++ ;?><\/p>\n\n\n\n

\u3000\u3000\u3000\u3000\u3000\u3000\u5728b.php\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9\u662f $a=5; require_once\uff08”a.php”\uff09; echo $a; require_once\uff08”a.php”\uff09; echo $a;<\/p>\n\n\n\n

\u3000\u3000\u3000\u3000\u3000\u3000\u7ed3\u679c\u7b2c\u4e00\u5904\u8f93\u51fa\u7684\u662f6\uff0c \u7b2c\u4e8c\u5904\u8f93\u51fa\u7684\u8fd8\u662f6\uff0c\u8bf4\u660e\u3002\u3002_once\u53ea\u5305\u542b\u4e00\u6b21 \uff0c\u5982\u679c\u4e0d\u52a0once\uff0c\u5219\u7b2c\u4e8c\u5904\u8f93\u51fa\u7684\u4f1a\u662f7<\/p>\n\n\n\n

\u2465\u53d6\u820d<\/strong><\/p>\n\n\n\n

\u3000\u3000\u6bd4\u5982\u662f\u7cfb\u7edf\u914d\u7f6e\uff0c\u7f3a\u5c11\u4e86\uff0c\u7f51\u7ad9\u4e0d\u8ba9\u8fd0\u884c\uff0c\u81ea\u7136\u7528require\uff0c\u5982\u679c\u662f\u67d0\u4e00\u6bb5\u7edf\u8ba1\u7a0b\u5e8f\uff0c\u5c11\u4e86\uff0c\u5bf9\u7f51\u7ad9\u53ea\u662f\u5c11\u7edf\u8ba1\u4eba\u6570\u7f62\u4e86\uff0c\u4e0d\u662f\u5fc5\u987b\u8981\u7684\uff0c\u53ef\u4ee5\u7528include<\/p>\n\n\n\n

\u3000\u3000\u800c\u52a0\u4e0d\u52a0once\u662f\u6548\u7387\u4e0a\u7684\u533a\u522b\uff0c\u52a0\u4e0aonce\uff0c\u867d\u7136\u7cfb\u7edf\u5e2e\u4f60\u8003\u8651\u4e86\u53ea\u52a0\u8f7d\u4e00\u6b21\uff0c\u4f46\u7cfb\u7edf\u7684\u5224\u65ad\u4f1a\u662f\u6548\u7387\u964d\u4f4e\uff0c\u56e0\u6b64\uff0c\u66f4\u5e94\u8be5\u5728\u5f00\u53d1\u4e4b\u521d\uff0c\u5c31\u628a\u76ee\u5f55\u7ed3\u6784\u8c03\u6574\u597d\uff0c\u5c3d\u91cf\u4e0d\u8981\u7528_once\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n

\u2466\u7279\u6b8a\u7528\u6cd5
<\/strong>
\u3000\u3000\u5229\u7528include\/require\u8fd4\u56de\u88ab\u5305\u542b\u9875\u9762\u7684\u8fd4\u56de\u503c<\/p>\n\n\n\n

\u3000\u3000\u3000\u3000a.php\u9875\u9762\u4e2d: ….. return $value; b.php\u9875\u9762\u4e2d:$v = include(“a.php”);<\/p>\n","protected":false},"excerpt":{"rendered":"

1\u3001PHP\u53d8\u91cf\u3001\u5e38\u91cf\u5927\u5c0f\u5199\u4e0d\u4e00\u6837\uff0c\u4ee5$\u5f00\u5934\uff0c\u6bcf\u53e5\u7ed3\u675f\u7b26\u53f7\u662f; \u5e38\u91cf\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u6807\u8bc6\u7b26\u3002\u5728\u811a\u672c\u6267\u884c\u671f\u95f4\u8be5\u503c\u4e0d\u80fd\u6539\u53d8\uff08\u9664\u4e86\u6240\u8c13\u7684\u9b54\u672f\u5e38\u91cf\uff0c\u4ed6\u4eec\u5176\u5b9e\u4e0d\u662f\u5e38\u91cf\uff09\u3002\u5e38\u91cf\u9ed8\u8ba4\u5927\u5c0f\u5199\u654f\u611f\u3002\u901a\u5e38\u5e38\u91cf\u6807\u8bc6\u7b26\u603b\u662f\u5927\u5199\u7684\u3002 \u4e00\u3001\u5e38\u91cf\u548c\u53d8\u91cf\u6709\u5982\u4e0b\u4e0d\u540c\uff1a 1\u3001\u5e38\u91cf\u524d…<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[7],"tags":[],"class_list":["post-948","post","type-post","status-publish","format-standard","hentry","category-7"],"views":243,"_links":{"self":[{"href":"https:\/\/site.uugo.cf\/index.php?rest_route=\/wp\/v2\/posts\/948","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/site.uugo.cf\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/site.uugo.cf\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/site.uugo.cf\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/site.uugo.cf\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=948"}],"version-history":[{"count":5,"href":"https:\/\/site.uugo.cf\/index.php?rest_route=\/wp\/v2\/posts\/948\/revisions"}],"predecessor-version":[{"id":953,"href":"https:\/\/site.uugo.cf\/index.php?rest_route=\/wp\/v2\/posts\/948\/revisions\/953"}],"wp:attachment":[{"href":"https:\/\/site.uugo.cf\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=948"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/site.uugo.cf\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=948"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/site.uugo.cf\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=948"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}