Rely on $ SERVER['REQUEST URI']?

Is $_SERVER['REQUEST_URI'] always available?

[Zuulo]

Hello!
I use code like

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^ /index.php

to handle all requests for pages in my index.php file. Can I be sure, that

$_SERVER['REQUEST_URI']

is always available? (It's important, because I use this variable to find out what page was requested.)

Greetings, Zuulo

[g1smd]

It should always be there, or a variant of it, but it might easily contain something quite malicious so it should be cleaned and verified before doing anything else with it.

I find this code quite useful:

if( !empty( $GLOBALS[ '_SERVER' ])) {
$_SERVER_ARRAY= '_SERVER';
} elseif( !empty( $GLOBALS[ 'HTTP_SERVER_VARS' ])) {
$_SERVER_ARRAY= 'HTTP_SERVER_VARS';
} else {
$_SERVER_ARRAY= 'GLOBALS';
}

$requestHost= ${$_SERVER_ARRAY}[ 'SERVER_NAME' ];

$datetime= gmdate( 'Y-m-d H:i:s O' );

$remoteIP= ${$_SERVER_ARRAY}[ 'REMOTE_ADDR' ];

$requestURI= ${$_SERVER_ARRAY}[ 'REQUEST_URI' ];

$referer= ( isset( ${$_SERVER_ARRAY}[ 'HTTP_REFERER' ]))
? ${$_SERVER_ARRAY}[ 'HTTP_REFERER' ]
: '<unknown referer>';

$userAgent= ( isset( ${$_SERVER_ARRAY}[ 'HTTP_USER_AGENT' ]))
? ${$_SERVER_ARRAY}[ 'HTTP_USER_AGENT' ]
: '<unknown user agent>';

[Zuulo]

Thank you g1smd!
[Cleaning: There's only a limited number of pages, so I use a whitelist ->

if(in_array($requested, $allowed)){ ... }

.]