ITSynOpen/server/ping-get.php

<?php
require_once('config.inc.php');

$apikeys = $config['ping-get'];

header('Content-type: text/plain');
if(isset($_GET['apikey']) && in_array($_GET['apikey'], $apikeys, true)) {
    $str=file_get_contents('pinged.txt');
    echo $str;
    file_put_contents ( 'pinged.txt' , 'false' );
} else {
    $str=file_get_contents('pinged.txt');
    echo "API Key Missing!\n";
    echo $str;
}
?>