Fixes broken $_SERVER['DOCUMENT_ROOT'] with Apache VirtualDocumentRoot

virtual.prepend.php

/**
 * URL Patterns to look for
 * This function is used to fix the document root for sites that are using
 * one of my VirtualDocumentRoot site entries
 * This is to fix a bug in Apache's mod_vhost_alias not setting up the correct 
 * $_SERVER['DOCUMENT_ROOT'] env variable.
 * 
 * trunk.{directory}.local - maps to /Users/tjboudreaux/Sites/{directory}/trunk
 * branch.{branch-name}.{directory}.local - maps to /Users/tjboudreaux/Sites/{directory}/branches/{branch-name}
 * 
 * @author Travis Boudreaux
 * @link http://www.devcha.com/2010/02/solved-incorrect-value-for.html
 */


$host = explode(".",$_SERVER['HTTP_HOST']);

if ($host[sizeof($host)-1] == "local")
    unset($host[sizeof($host)-1]);

$suffix = "";
if ($host[0] == "trunk") {
    unset($host[0]);
    $suffix ="/trunk";
} elseif ($host[0] == "branch") {
    $suffix = "/branches/" . $host[1];
    unset($host[0]);
    unset($host[1]);
    
}

$fixed_vhost_dir = "/User/tjboudreaux/Sites/" . implode(".",$host) . $suffix; 
if (is_dir($fixed_vhost_dir) && $_SERVER['DOCUMENT_ROOT'] == '/Library/WebServer/Documents') {
    $_SERVER['__MOD_VHOST_FIX_OLD_DOCUMENT_ROOT'] = $_SERVER['DOCUMENT_ROOT'];
        $_SERVER['DOCUMENT_ROOT'] = $fixed_vhost_dir;
}