getallheaders function in PHP

getallheaders.php

<?php
if(!function_exists('getallheaders')){
    function getallheaders(){
        $headers = array();
        foreach ($_SERVER as $name => $value){
            if(substr($name, 0, 5) == 'HTTP_'){
                $name = str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))));
                $headers[$name] = $value;
            } else if($name == "CONTENT_TYPE") {
                $headers["Content-Type"] = $value;
            } else if($name == "CONTENT_LENGTH") {
                $headers["Content-Length"] = $value;
            } else{
                $headers[$name]=$value;
            }
       }
       return $headers;
    }
}