Description:
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So zend_create_closure correctly detects that this is wrong ... and then just goes on to bind NULL for $this, which is a lot worse.

This has been fixed for PHP 7.0 as a side-effect of https://github.com/php/php-src/commit/4b821f0fc6aade0eb9793a8b4fa3cd28b347ac2f, but needs to be fixed for PHP 5.6 as well.

Test script:
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<?php
class cls {}
$c = (new ReflectionMethod('SplStack', 'count'))->getClosure(new SplStack);
$c = $c->bindTo(new cls);
$c();