Get the http headers from current request in PHP

Question

Is it possible to get the http headers of the current request with PHP? I am not using Apache as the web-server, but using nginx.

I tried using

Answer 1

Combined getallheaders() + apache_request_headers() for nginx

    function get_nginx_headers($function_name='getallheaders'){

        $all_headers=array();

        if(function_exists($function_name)){ 

            $all_headers=$function_name();
        }
        else{

            foreach($_SERVER as $name => $value){

                if(substr($name,0,5)=='HTTP_'){

                    $name=substr($name,5);
                    $name=str_replace('_',' ',$name);
                    $name=strtolower($name);
                    $name=ucwords($name);
                    $name=str_replace(' ', '-', $name);

                    $all_headers[$name] = $value; 
                }
                elseif($function_name=='apache_request_headers'){

                    $all_headers[$name] = $value; 
                }
            }
        }


        return $all_headers;
}