I just upgraded to WordPress 3.1.1 and suddenly I'm getting the following error:

Fatal error: Call to undefined function wp_get_current_user() in /home/arisehub/arisehub.org/wp-includes/capabilities.php on line 1028

I've narrowed it down to my usage of "current_user_can"

Example: if ( !current_user_can('manage_options') ) { add_action('admin_init','customize_page_meta_boxes'); }

Removing that reference to current_user_can removes the errors. Any ideas?

1 Answer 1


You are calling the function too early. The functions.php is included before current_user_can() is defined. Never do anything before the hook 'after_setup_theme':

Example for the functions.php

add_action( 'after_setup_theme', array( 'WPSE_14041_Base', 'setup' ) );

class WPSE_14041_Base
    public static function setup()
        ! isset ( $GLOBALS['content_width'] ) and $GLOBALS['content_width'] = 480;

        add_theme_support( 'post-thumbnails', array( 'post', 'page' ) );
        add_theme_support( 'automatic-feed-links' );

        add_theme_support( 'menus' );



        // You may use current_user_can() here. And more. :)
  • 2
    Actually the 'plugins_loaded' action is fired almost immediately after the pluggable.php file is loaded, this would be the optimal action to hook. Jan 23, 2012 at 22:53
  • add_action isn't defined until after functions.php is included! Where should this code be placed? @toscho
    – bozdoz
    Oct 11, 2012 at 22:41
  • @bozdoz add_action() exists already at the very bottom of the wp-config.php. That's very early even before the mu-plugins are loaded.
    – fuxia
    Oct 12, 2012 at 1:33

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