A PHP function to check for cookies

I've written a php function and some helper functions that checks for cookies when somebody lands on a page but it's not so fast. I want to know is there any way to make it faster or improve it i know it's possible to check for cookies client side using javascript but what if it is disabled also so i need a pure server side solution.

<?php

function check_cookie(){
    if(is_cookie_disabled()){
        header("location:cookie_is_disabled.php");
        exit;
    }        
}

function is_cookie_disabled(){
    $curr_url = $_SERVER['PHP_SELF'];
    if(isset($_COOKIE['testCookie']) && !(isset($_COOKIE['cookie']))){
        $original_url = original_url ($curr_url);
        header("location: ".$original_url);
        setcookie("cookie", 'enabled');
        exit;
    } elseif(!(isset($_COOKIE['testCookie']))) {
        if(isset($_GET['temp'])){                
            return true;
        } else{
            if(if_parameters_exist_in_url($curr_url)){
                $url = $curr_url."&temp=temp";
            } else {
                $url = $curr_url."?temp=temp";
            }
            header("location: ".$url);
            setcookie("testCookie", 'test');
            exit;              
        }
    }
    return false;
}

function original_url ($curr_url){
    if (!empty($_GET)){
        if (isset($_GET['temp'])) {
            if(count($_GET)>0){
                return removeqsvar($curr_url, 'temp');
            } else {
                return removeallvars($curr_url);
            }
        }
    }
    return $curr_url;
}    

function removeqsvar($url, $varname) {
    return preg_replace('/([?&])'.$varname.'=[^&]+(&|$)/','$1',$url);
}

function removeallvars($url){
    return $url = strtok($url, '?');
}

function if_parameters_exist_in_url($url){
    if (strpos($url, '=')) {
        return true;
    } else {
        return false;
    }
}    

//at the top of your pages
check_cookie();

?>