ITSynOpen/server/ping-get.php

<?php

require_once('config.inc.php');
$apikeys = $config['ping-get'];

header('Content-type: text/plain');

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
	echo "Must use POST request method\n";
	return;
}

if (!isset($_GET['apikey']) || !in_array($_GET['apikey'], $apikeys, true)) {
	echo "Invalid API key\n";
	return;
}

$str=file_get_contents('pinged.txt');
echo $str;
file_put_contents('pinged.txt', 'false');

?>