calling of user functions change

[billzeller]

On line 1093 on wp-includes/functions.php in function apply_filters, the line

$string = $function($string);

should be

$string = call_user_func($function, $string);

This would allow actions to be set as either add_action('publish_post', 'myFunction'); or add_action('publish_post', array('MyClass', 'myFunction'));

Existing plugins would work with this change.