[PATCH] Fix segfault in filter extension when using callbacks

The filter extensinon will segfault if a callback filter returns FALSE, this little patch fixes that. There is also no way to set default value if the callback fails because of a design flow. When dealing with callbacks the 'options' key in the options parameters just be a valid callback, but to set a default value then this key must be a array that includes the key 'default'. Test case: function filter_test($str) { return FALSE; } var_dump(filter_var('durty/boy', FILTER_CALLBACK, array( 'options' => 'filter_test', ))); Arnar Mar Sig