<?php
class TestSingleton 
{ 
	private static $instance = null;
	private function __construct(){}
	public $crazy;
	 
	  function getInstance() 
	  { 
	  if ( self::$instance == null ) 
		  self::$instance = new TestSingleton(); 
		  return self::$instance; 
	  } 
		  
	  function great(){
	  	$crazy = "YesYes";
	  	return $crazy;
	  }
}

$a = TestSingleton::getInstance();
$b = TestSingleton::getInstance();

echo $a->great();
echo $b->great();


?>