--TEST--
output buffering - multiple
--FILE--
<?php
echo 0;
	ob_start();
		ob_start();
			ob_start();
				ob_start();
					echo 1;
				ob_end_flush();
				echo 2;
			$ob = ob_get_clean();
		echo 3;
		ob_flush();
		ob_end_clean();
	echo 4;
	ob_end_flush();
echo $ob;
?>
--EXPECT--
03412