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Snippet Name: Fix missing $_SERVER SCRIPT_URL variable

Description: Many scripts rely on $_SERVER[SCRIPT_URL] which is sometimes missing. This function detects it from other server variables and fixes the missing field.

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Comment: (none)

Author: CoderZone
Language: PHP
Highlight Mode: PHP
Last Modified: March 16th, 2009

 * Tries to determine Servers' SCRIPT_URL, if it doesn't exist.
 * The missing superglobal $_SERVER array element will be fixed.
 * Example: client requests ... 
 * ...$_SERVER['SCRIPT_URL'] is (or becomes)
 * "/testpage.html"
function get_script_url() 
    $script_url = null;
    if (!empty($_SERVER['SCRIPT_URL']))   
        $script_url = $_SERVER['SCRIPT_URL'];
    elseif (!empty($_SERVER['REDIRECT_URL'])) 
        $script_url = $_SERVER['REDIRECT_URL'];
    elseif (!empty($_SERVER['REQUEST_URI'])) {
        $p = parse_url($_SERVER['REQUEST_URI']);
        $script_url = $p['path'];
    else die (__FILE__." / ".__FUNCTION__.':<br />Couldn\'t determine $_SERVER["SCRIPT_URL"].');
    $_SERVER['SCRIPT_URL'] = $script_url;
    return $script_url;
} // get_script_url()
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