Determine whether the request comes from curl

index.php

<?php
    function is_curl(){
        $regex_match="/curl/";
        return isset($_SERVER['HTTP_X_WAP_PROFILE']) or isset($_SERVER['HTTP_PROFILE']) or preg_match($regex_match, strtolower($_SERVER['HTTP_USER_AGENT']));
    }
        if(is_curl()) {
            echo 'status=0';
        } else {
            header( "HTTP/1.1 301 Moved Permanently"); 
            header("Location: https://sdrotg.com"); 
        }
?>