-=[ Mr. Bumblebee ]=-
_Indonesia_

--TEST--
Bug #39445 (Calling debug_backtrace() in the __toString() function produces a crash)
--FILE--
<?php
class test {
	public function __toString() {
		debug_backtrace();
		return 'lowercase';
	}
}

	$test = new test();
	echo strtoupper($test);
?>
--EXPECT--
LOWERCASE