Title: PHP Warning: call_user_func() expects parameter 1
Last modified: July 24, 2021

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# PHP Warning: call_user_func() expects parameter 1

 *  Resolved [sprocker](https://wordpress.org/support/users/sprocker/)
 * (@sprocker)
 * [4 years, 10 months ago](https://wordpress.org/support/topic/php-warning-call_user_func-expects-parameter-1/)
 * Hi, the plugin is working great but I am getting the following error, can you
   advise on the fix please? thanks
 * [24-Jul-2021 09:29:47 UTC] PHP Warning: call_user_func() expects parameter 1 
   to be a valid callback, no array or string given in /var/www/vhosts/domainname.
   com/httpdocs/wp-content/plugins/woo-accordions/includes/accordion-tabs.php on
   line 30
 * This is the code at line 30: <?php call_user_func( $tab[‘callback’], $key, $tab);?
   >

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## Tags

 * [PHP Warning](https://wordpress.org/support/topic-tag/php-warning/)

 * 0 replies
 * 1 participant
 * Last reply from: [sprocker](https://wordpress.org/support/users/sprocker/)
 * Last activity: [4 years, 10 months ago](https://wordpress.org/support/topic/php-warning-call_user_func-expects-parameter-1/)
 * Status: resolved