Update DNS Made Easy DDNS Record with Local IP

ddns.php

#!/usr/bin/php
<?php
	/**
	 * Update DNS Made Easy DDNS Record with Local IP
	 * http://www.joelambert.co.uk
	 *
	 * Copyright 2012, Joe Lambert.
	 * Free to use under the MIT license.
	 * http://joelambert.mit-license.org/
	 */
	
	// The record you wish to update
	$dns_record = array(
		// A label representation of the record
		'label' => "*.mydomain.com",
		// The DNS record's ID - found in the DNS Made easy control panel
		'id' 	=> 123456,
	);
	
	// Your DDNS username/password
	$username = "username";
	$password = "password";

	// Work out the local IP Address
	exec('ifconfig en1', $response);
	$response = implode("\n", $response);
	preg_match("/inet ([0-9\.]+)/", $response, $matches);
	$new_ip = $matches[1];

	// Make the API Call
	echo "Updating {$dns_record['label']} to $new_ip\n";
	$response = file_get_contents("http://www.dnsmadeeasy.com/servlet/updateip?username={$username}&password={$password}&id={$dns_record['id']}&ip={$new_ip}");
	echo trim($response) . "\n";

	// Clear the local DNS cache
	exec('dscacheutil -flushcache');
?>