Bypassing apache_request_headers() for phpunit

bypass.php

<?php
function request_headers()
{
    if(function_exists("apache_request_headers")) // If apache_request_headers() exists...
    {
        if($headers = apache_request_headers()) // And works...
        {
            return $headers; // Use it
        }
    }

    $headers = array();

    foreach(array_keys($_SERVER) as $skey)
    {
        if(substr($skey, 0, 5) == "HTTP_")
        {
            $headername = str_replace(" ", "-", ucwords(strtolower(str_replace("_", " ", substr($skey, 0, 5)))));
            $headers[$headername] = $_SERVER[$skey];
        }
    }

    return $headers;
}