Description:
------------
Attached code causes segmentation fail error in PHP.

Reproduce code:
---------------
<?php
class cABC{	
	public function url_stat($path, $flags){
		return stat($path);
	}
}

stream_wrapper_register ('abc', 'cABC');

var_dump(file_exists('abc://non/existant/scheme/url.file'));
?>

Expected result:
----------------
Standart PHP error (warning) expected.

Actual result:
--------------
Crash.