php man page for _request

_REQUEST(3)								 1							       _REQUEST(3)

$_REQUEST - HTTP Request variables

	An associative array that by default contains the contents of $_GET, $_POST and $_COOKIE.

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.3.0	|						    |
       |	|						    |
       |	|  Introduced request_order. This directive affects |
       |	| the contents of $_REQUEST.			    |
       |	|						    |
       | 4.3.0	|						    |
       |	|						    |
       |	|  $_FILES information was removed from $_REQUEST.  |
       |	|						    |
       | 4.1.0	|						    |
       |	|						    |
       |	|		Introduced $_REQUEST.		    |
       |	|						    |
       +--------+---------------------------------------------------+
       Note

	      This is a 'superglobal', or automatic global, variable. This simply means that it is available in all scopes  throughout	a  script.
	      There is no need to do global $variable; to access it within functions or methods.

       Note

	       When running on the command line , this will not include the argv and argc entries; these are present in the $_SERVER array.

       Note

	       The  variables  in $_REQUEST are provided to the script via the GET, POST, and COOKIE input mechanisms and therefore could be modi-
	      fied by the remote user and cannot be trusted. The presence and order of variables listed in this array is defined according to  the
	      PHP variables_order configuration directive.

       import_request_variables(3), Handling external variables, The filter extension.

PHP Documentation Group 													       _REQUEST(3)