Warning: call_user_func_array() expects parameter 1 to be a valid callback, in wp-includes\class-wp-hook.php on line 287

Question

I am creating my first WordPress theme for personal use, when I added main function in functions.php, website showing an warning on top.

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'myfirsttheme_setup ' not found or invalid function name in G:\wamp64\www\mysite\wp-includes\class-wp-hook.php on line 287.

Should I define myfirsttheme_setup function first? If yes, then how?

My code is here:

<?php /** * @package myfirsttheme * @since myfirsttheme */ if ( ! function_exists( 'myfirsttheme_setup' ) ) : /** * support post thumbnails. */ function myfirsttheme_setup() { add_theme_support( 'custom-header' ); add_theme_support('menus'); add_theme_support('post-thumbnails'); add_theme_support( 'automatic-feed-links' ); add_theme_support( 'title-tag' ); add_theme_support( 'customize-selective-refresh-widgets' ); } endif; // myfirsttheme_setup add_action( 'after_setup_theme', 'myfirsttheme_setup' );

Hi Mukesh, can I suggest that when putting up a question that you show that you've read the existing documentation. I'm sure you have - but its a good idea to take time out to show that you have by providing a couple of links. In this case the answer to your question is here, in the WordPress themes documentation: developer.wordpress.org/themes/basics/theme-functions/… — Sez
– Sez, Commented Jul 2, 2020 at 6:09

Phil F · Accepted Answer · 2020-07-02 05:50:03Z

The code you entered is correct. myfirsttheme_setup just needs to be defined before the after_setup_theme action hook is executed. It does not need to be defined when you add the hook. The action hook will just store the string in $wp_filter global and then call call_user_func_array at execution of the hook. Your issue must be somewhere else. I would search for myfirsttheme_setup throughout your entire install. You have to be trying to hook to it before it's defined or changing myfirsttheme_setup to not be callable in another place.

You do always have the option of making it an anonymous function as well.

add_action('after_setup_theme', function () { add_theme_support('custom-header'); add_theme_support('menus'); add_theme_support('post-thumbnails'); add_theme_support('automatic-feed-links'); add_theme_support('title-tag'); add_theme_support('customize-selective-refresh-widgets'); });

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