small nagios check_disk wrapper to trigger through php

check_disk.php

<?php

// global binary
$NAGIOS_DISK = "/usr/lib/nagios/plugins/check_disk";
$DISK_KEY = "Uvg2kFMfy3DU";

if (isset($_GET['key'], $_GET['w'], $_GET['c'])) {
	// okay
	$key = $_GET['key'];
	$warning = $_GET['w'];
	$critical = $_GET['c'];

	if(! (preg_match('/^[0-9]+%$/', $warning) && preg_match('/^[0-9]+%$/', $critical)) ) {
		echo "Critical or Warning values are not a valid value.\n";
		header("HTTP/1.0 510 Not Extended");
		exit;
	}

	if ($key == $DISK_KEY ) {
		// correct key

		$return = shell_exec("$NAGIOS_DISK -l -x /dev/shm -w $warning -c $critical");

		if (stripos($return,"OK")) {
			print "$return\n";
			header("HTTP/1.0 200 Okay");
		} else {
			print "$return\n";
			header("HTTP/1.0 507 Insufficient Storage");
		}

	} else {
		print "ERROR\n";
		header("HTTP/1.0 401 Unauthorized");
	}

} else {
	// error
	print "ERROR\n";
	header("HTTP/1.0 418 I’m a teapot");
}

?>