Finding page id of Facebook fan-page

Sometimes you come to a situation when you need the page id of the Facebook fan page. This happens usually when you are writing Facebook application that needs to use the Facebook fan-pages. If you have been to the situation then here's you solution. It just a few lines of code
which is as follows:

	<?php
	/**
	* A simple library to assist in getting the Facebook Fan Page Id
	* @author Paras Nath Chaudhary
	* @copyright CopyLeft (ↄ) 2013, writephp.blogspot.com
	* @license GPL
	* @since Version 1.0
	* @version 1.0
	Implementation
	================
	<?php
	require_once 'facebookHelper.php';
	echo getPageId("http://www.facebook.com/nosklub");
	?>
	*/
	function getPageId($fanpageUrl){
	$url=str_replace('www', 'graph', $fanpageUrl);
	$json = file_get_contents($url);
	$contents=json_decode($json);
	return $contents->id;
	}
	?>

view raw facebookHelper.php hosted with ❤ by GitHub

This simple program echoes your Facebook fan-page when "http://www.facebook.com/nosklub" is replaced with the url of your Facebook Fan-page.
No rocket science right?  :) And yeah one more thing to add, this not only just gives you the id of your fanpage, it also returns the facebook id of the user, supplied the persons facebook url e.g. http://www.facebook.com/opnchaudhary