Summary of methods for obtaining paths and directories in PHP [must read] and tips

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PHP’s method of obtaining the directory sum is through magic variables; through super global variables; through related functions, etc.:

<?php

/**

* PHP获取路径或目录实现

*/



//魔术变量，获取当前文件的绝对路径

echo "__FILE__: ========> ".__FILE__; 

echo &#39;<br/>&#39;;



//魔术变量，获取当前脚本的目录

echo "__DIR__: ========> ".__DIR__;

echo &#39;<br/>&#39;;



//dirname返回路径的目录部分,dirname(__FILE__)相当于__DIR__

echo "dirname(__FILE__): ========> ".dirname(__FILE__);

echo &#39;<br/>&#39;;



//$_SERVER[&#39;PHP_SELF&#39;]和$_SERVER[&#39;SCRIPT_NAME&#39;]的结果一般相同，他们都是获取当前脚本的文件名

//只有当php以cgi方式运行时有区别，但是现在几乎找不到以cgi方式运行php了

echo &#39;$_SERVER["PHP_SELF"]: ========> &#39;.$_SERVER[&#39;PHP_SELF&#39;];

echo &#39;<br/>&#39;;



echo &#39;$_SERVER["SCRIPT_NAME"]: ========> &#39;.$_SERVER[&#39;SCRIPT_NAME&#39;];

echo &#39;<br/>&#39;;



//当前执行脚本的绝对路径。记住，在CLI方式运行php是获取不到的

echo &#39;$_SERVER["SCRIPT_FILENAME"]: ========> &#39;.$_SERVER[&#39;SCRIPT_FILENAME&#39;];

echo &#39;<br/>&#39;;



//当前运行脚本所在的文档根目录。在服务器配置文件中定义。

echo &#39;$_SERVER["DOCUMENT_ROOT"]: ========> &#39;.$_SERVER[&#39;DOCUMENT_ROOT&#39;];

echo &#39;<br>&#39;;



//getcwd()返回当前工作目录

echo "getcwd(): ========> ".getcwd();

echo &#39;<br>&#39;;



echo &#39;<br>&#39;;

echo "本文来自脚本之家";

The print result is as follows [My root directory is: G:/web]:

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