Wordpress 4.7 call_user_func_array()

Question

Updated to WordPress 4.7, and am receiving this error when I have one of my custom-made plugins enabled:

( ! ) Warning: call_user_func_array() expects parameter 1 to be a valid callback, no array or string given in /home/vagrant/Sites/wordpress/wp includes/class-wp-hook.php on line 298

I also get this with my debugging enabled:

I am uncertain as to what the issue is, as the stack trace seems rather cryptic. Any advice on what may have broken the plugin, or how to diagnose the problem?

Here is the SVN repository: http://plugins.svn.wordpress.org/rsvpify-rsvp-form/ — boisterouslobster, Dec 13 '16 at 03:17
Hello, add_action('plugins_loaded', $this->plugin_update()); check this line in your plugin something here you need modified go to admin->class-rsvpify-embedd-admin.php — Afzal, Dec 13 '16 at 07:24
I am not sure I understand -- is there something wrong with that method in particular, or the way I am calling it? — boisterouslobster, Dec 14 '16 at 01:23

score 5 · Accepted Answer · answered Dec 24 '16 at 10:24

As @Afzal mentioned this line is problematic:

add_action('plugins_loaded', $this->plugin_update());

We can replicate the error you got with this simple example:

class Test
{
    public function init()
    {
        add_action( 'plugins_loaded', $this->plugin_update() );
    }

    public function plugin_update()
    {
    }
}

$obj = new Test;
$obj->init();

The usual way around this problem is to replace:

add_action( 'plugins_loaded', $this->plugin_update() );

with:

add_action( 'plugins_loaded', array( $this, 'plugin_update' ) );

Awesome, thanks! Need to wait 10 hours before I can award you the bounty, though. — boisterouslobster, Dec 24 '16 at 19:29

Wordpress 4.7 call_user_func_array()

1 Answers1