Example of PHP getting the current path and Directory

Source: Internet
Author: User
Tags php tutorial

PHP obtains directories and methods through magic variables, Super global variables, and related functions:

The code is as follows: Copy code

<? Php
* PHP path or directory retrieval implementation
* @ Link http://www.111cn.net
// Magic variable to obtain the absolute path of the current file
Echo "_ FILE __:=======>". _ FILE __;
Echo '<br/> ';
// Magic variable to get the Directory of the current script
Echo "_ DIR __:=======>". _ DIR __;
Echo '<br/> ';
// Dirname indicates the Directory of the returned path. dirname (_ FILE _) is equivalent to _ DIR __
Echo "dirname (_ FILE _): =======>". dirname (_ FILE __);
Echo '<br/> ';
// $ _ SERVER ['php _ SELF '] and $ _ SERVER ['script _ name'] have the same results. They both obtain the file NAME of the current SCRIPT.
// The difference only occurs when php runs in cgi mode, but it cannot be found to run php in cgi mode.
Echo '$ _ SERVER ["PHP_SELF"]: =======>'. $ _ SERVER ['php _ SELF '];
Echo '<br/> ';
Echo '$ _ SERVER ["SCRIPT_NAME"]: =======>'. $ _ SERVER ['script _ name'];
Echo '<br/> ';
// The absolute path of the script being executed. Remember, you cannot get it when running php in CLI mode.
Echo '$ _ SERVER ["SCRIPT_FILENAME"]: =======>'. $ _ SERVER ['script _ filename'];
Echo '<br/> ';
// The root directory of the file where the script is currently running. Defined in the server configuration file.
Echo '$ _ SERVER ["DOCUMENT_ROOT"]: =======>'. $ _ SERVER ['document _ root'];
Echo '<br> ';
// Getcwd () returns the current working directory
Echo "getcwd (): ======>". getcwd ();
Echo '<br> ';
Echo '<br> ';
Echo "php Tutorial (www.111cn.net ";

(Note: $ HTTP_SERVER_VARS and $ _ SERVER are different variables. PHP processes them differently .) If the register_globals command is set, these variables are also available in all scripts; that is, the $ _ SERVER and $ HTTP_SERVER_VARS arrays are separated.

$ _ SERVER ['http _ host'] retrieves the HOST of the current request: header content
$ _ SERVER ['php _ SELF '], which is probably the most frequently used one. It returns the name of the currently called page, if it is http: // localhost/test/2005/test. php,/test/2005/test will be returned. php
$ _ SERVER ['script _ name'] returns the path containing the current SCRIPT. This is useful when the page needs to point to itself.
$ _ SERVER ['script _ filename'] it returns the absolute path of the current file.
$ _ SERVER ['request _ URI '] returns the URI required to access this page, including "/"

Of course there are many path functions:
Dirname (), returns the directory section in the path information, which is prefixed "/"
Basename () returns the basic file name in the path. You can also set a suffix to control the output.
Realpath (), returns the path information of the absolutely normalized path

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