Online PHP editor | output for fXsa2

<?php //skipped retrieving from the database, and doing // $urls = array_column($rows, 'urls'); $urls = [ 'http://www2.trafficadbar.com/__a4w4', 'http://trafficadbar.com/__a4w4', 'http://www.trafficadbar.com/__a4w4', 'http://4acesmailer.com/credit_click.php?userid=2472&openkey=gbyp2vcm', 'http://4acesmailer.com/credit_click.php?userid=2714&openkey=gbyp2vcm', 'http://4acesmailer.com/credit_click.php?userid=2723&openkey=gbyp2vcm', 'http://4acesmailer.com/credit_click.php?userid=3245&openkey=gbyp2vcm', 'http://4acesmailer.com/credit_click.php?userid=3259&openkey=gbyp2vcm', ]; $results = []; foreach($urls as $url){ //eg: www2.trafficadbar.com $host = parse_url($url,PHP_URL_HOST); $matches = []; //find top level domain or skip to next URL if(!preg_match('/[^\.]*\.[^\.]+$/',$host,$matches)) continue; //eg: trafficadbar.com $domain = $matches[0]; //increment the count for this domain in results if(!isset($results[$domain])) $results[$domain]=0; $results[$domain]++; } print_r($results);