PHP gets directories and methods through magic variables, through super global variables, through related functions and so on:

1<?PHP2     /**3 * PHP Get path or directory implementation4 * @link http://www.phpddt.com5      */6      7     //Magic variable to get the absolute path of the current file8     Echo"__FILE__: ========>".__file__; 9     Echo' <br/> ';Ten       One     //Magic variable, gets the directory of the current script A     Echo"__dir__: ========>".__dir__; -     Echo' <br/> '; -       the     //dirname Returns the directory portion of the path, DirName (__file__) is equivalent to __dir__ -     Echo"DirName (__file__): ========>".dirname(__file__); -     Echo' <br/> '; -       +     //the results of $_server[' php_self ' and $_server[' script_name '] are generally the same, they all get the file name of the current script - //Only when PHP is running in CGI mode, but now it's almost impossible to find a CGI run of PHP. +     Echo' $_server[' php_self "]: ========> '.$_server[' Php_self ']; A     Echo' <br/> '; at       -     Echo' $_server[' Script_name "]: ========> '.$_server[' Script_name ']; -     Echo' <br/> '; -       -     //the absolute path of the current execution script. Remember that running PHP in the CLI mode is not available -     Echo' $_server[' Script_filename "]: ========> '.$_server[' Script_filename ']; in     Echo' <br/> '; -       to     //the document root directory where the script is currently running. Defined in the server configuration file.  +     Echo' $_server[' Document_root "]: ========> '.$_server[' Document_root ']; -     Echo' <br> '; the       *     //GETCWD () returns the current working directory $     Echo"GETCWD (): ========>".GETCWD();Panax Notoginseng     Echo' <br> '; -       the     Echo' <br> '; +     Echo"PHP Point-to-point (www.phpddt.com) collation";

PHP gets directories and methods through magic variables, through super global variables, through related functions and so on: