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PHP reserved variable Request


$_REQUEST — HTTP Request variables

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

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.

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

The variables in $_REQUEST are provided to the script via the GET, POST, and COOKIE input mechanisms and therefore could be modified 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.



				$_GET['foo'] = 'a';
				$_POST['bar'] = 'b';
				var_dump($_GET); // Element 'foo' is string(1) "a"
				var_dump($_POST); // Element 'bar' is string(1) "b"
				var_dump($_REQUEST); // Does not contain elements 'foo' or 'bar'




				case 'GET': $the_request = &$_GET; break;
				case 'POST': $the_request = &$_POST; break;
				. // Etc.


				function add_or_change_parameter($parameter, $value) 
				  $params = array(); 
				  $output = "?"; 
				  $firstRun = true; 
				  foreach($_GET as $key=>$val) 
				   if($key != $parameter) 
				     $output .= "&"; 
				     $firstRun = false; 
				    $output .= $key."=".urlencode($val); 
				   $output .= "&"; 
				  $output .= $parameter."=".urlencode($value); 
				  return htmlentities($output); 

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