Title: PHP Warning: call_user_func_array()
Last modified: March 26, 2020

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# PHP Warning: call_user_func_array()

 *  Resolved [MFA](https://wordpress.org/support/users/mfabowl/)
 * (@mfabowl)
 * [6 years, 3 months ago](https://wordpress.org/support/topic/php-warning-call_user_func_array-6/)
 * Hi,
    Can anyone from the dev team explain this warning at my log file?
 * `PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback,
   function 'mk_woo_steps' not found or invalid function name in /home/user/public_html/
   wp-includes/class-wp-hook.php on line 288`

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Plugin Support [Kel C. a11n](https://wordpress.org/support/users/kellymetal/)
 * (@kellymetal)
 * [6 years, 3 months ago](https://wordpress.org/support/topic/php-warning-call_user_func_array-6/#post-12621962)
 * Hi there,
 * This would indicate that some function named `mk_woo_steps` was passed to `call_user_func_array`,
   however that function was not found. You can read about the PHP `call_user_func_array`
   function here:
    [https://www.php.net/manual/en/function.call-user-func-array.php](https://www.php.net/manual/en/function.call-user-func-array.php)
 * I did a full search of the WooCommerce code for `mk_woo_steps`, but nothing was
   found, so it seems that is most likely coming from some other plugin or theme
   on the site (perhaps one that works with Woo or adds functionality to the core
   plugin, since it does have `woo` in the name). I would recommend using a plugin
   like [String Locator](https://wordpress.org/plugins/string-locator/) to search
   the plugins/theme on your site to see where that function is located.
 * I hope that helps!
 *  Plugin Support [Kel C. a11n](https://wordpress.org/support/users/kellymetal/)
 * (@kellymetal)
 * [6 years, 3 months ago](https://wordpress.org/support/topic/php-warning-call_user_func_array-6/#post-12675951)
 * Hi there,
 * We haven’t heard back from you in a while, so I’m going to mark this thread as
   resolved. If you have any further questions, please start a new thread.
 * Have a wonderful day!
 *  Thread Starter [MFA](https://wordpress.org/support/users/mfabowl/)
 * (@mfabowl)
 * [6 years, 2 months ago](https://wordpress.org/support/topic/php-warning-call_user_func_array-6/#post-12684031)
 * Thank you! It wasn’t WooCommerce. The plugin you recommended solved the issue.

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘PHP Warning: call_user_func_array()’ is closed to new replies.

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 * 3 replies
 * 2 participants
 * Last reply from: [MFA](https://wordpress.org/support/users/mfabowl/)
 * Last activity: [6 years, 2 months ago](https://wordpress.org/support/topic/php-warning-call_user_func_array-6/#post-12684031)
 * Status: resolved