An algorithm to check for request parameters with _urls and validate them

urlcheck.php

foreach ($_REQUEST as $key => $value) {

    $ex = explode('_',$key);
    foreach ($ex as $k => $v) {
        if($v == 'url'){

$url = filter_var($value,FILTER_VALIDATE_URL,FILTER_FLAG_HOST_REQUIRED);

        if(!$url){
    http_response_code(403);
    echo  $Job->validationFailed('Website must be valid',$key . ' should match http://www.examplesite.com, attach protocol');
    return;
            }     
        }  
    }
}