id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc
20776,Improve callback verification while executing hooks,ericlewis,,"When executing hooks, we currently have a simple callback verification:

{{{
if ( !is_null($the_['function']) )
				call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args']));
}}}

This works in most cases, if everything is coded properly in the theme / plugins. However, there are cases when a bad callback makes it through this validation, such as dropping this in a theme or plugin:

{{{
add_action('init', array( NULL, 'method') );
}}}

Will cause an error you may be familiar with: 

Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'Array' was given in /path/to/wp/wp-includes/plugin.php on line 405.

Which can be a tricky issue to debug. 

I suggest using the is_callable() php function for verification instead, which should remove this warning from ever showing up. ",enhancement,closed,normal,,Plugins,,normal,wontfix,needs-patch,