Error: call_user_func_array() expects parameter 1 to be a valid callback

5 comments

1. Somewhere in your theme or plugins is a line like this:

   add_filter( 'something', 'regis_options' );
   

   Could also be add_action(). Find that piece of code and remove or fix it.

   The other errors are a result of the first one. The printed error message causes output and hence HTTP headers, so PHP/WP cannot send other headers anymore. They will go away when you fix the first error.

2. Warning: call_user_func_array()  
   

   It is usually caused by a filter or an action not properly declared.

   add_filter ( 'action_tag' , array( $this , 'my_callback' ) , 30 );
   

   The priority must be outside the callback array parameter. this fixed my issue.

3. Hi try this solution :

   Add this in functions.php:

   function regis_options($args) {
      return $args;
   }
   

   Also add this in your class-wp-hook.php:

   public function regis_options($args) {
   echo '<pre>' . var_export($args, true) . '</pre>';
   echo '<pre>' . var_dump(debug_backtrace()) . '</pre>';
   return $args;
   }
   

4. I had put a space at the end on my call back string on calling the filter

   add_filter( 'something', 'regis_options ' ); 
   

   Instead of

   add_filter( 'something', 'regis_options');
   

5. This error will also happen when you call for a function that does not exist.
   to solve it
   you need to define the ‘regis_options’ function
   try something like

   function regis_options(){ 
   echo 'test';
   }
   

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