<?php $url = (string)filter_input(INPUT_POST, 'url'); if (empty($url)) { exit; } if(substr($url, -1) == '/') { $url = substr($url, 0, -1); } $url .= '/spotter-ping'; $ch = curl_init($url); curl_setopt_array($ch, [CURLOPT_RETURNTRANSFER => TRUE, CURLOPT_HEADER => FALSE, CURLOPT_SSL_VERIFYHOST => FALSE, CURLOPT_SSL_VERIFYPEER => FALSE, CURLOPT_TIMEOUT => 4]); $content = curl_exec($ch); curl_close($ch); if ($content == 'spotter-pong') { echo 'spotter-pong'; }