for example:
class 
{
	private:
		var $myvar;
		var $myvar2:
	public:
		var $myvar3;

	function myfoo()
	{
		print "the variable is : " . $myvar
	}
}

will be converted "on the fly" by PHP interpreter to 
class
{
	var $myvar_993679346;
	var $myvar2_993679346:
	var $myvar3;

	function myfoo()
	{
		print "the variable is : " . $myvar_993679346;
	}
}

Note that 993679346 is the time stamp got by time(). PHP interpreter when it starts up will store this
timestamp value in a global var and use it throught to mangle all the private variables declared in
all the classes in all the files..

This will be dealt with with the new version of the Zend engine. The timeframe is a few months... so please stay tuned...

implemented in ZE2.