Change 2 fields in the post depending on the 3rd field before save

1 comment

1. Use the hook save_post and put an if inside the function that do the save after the ‘normal’ save meta fields routine.

   add_action( 'save_post', 'this_is_the_function_name' ); 
   
   function this_is_the_function_name( $post_id ) { 
   
       // No auto saves 
       if( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) return; 
   
       // make sure the current user can edit the post 
       if( ! current_user_can( 'edit_post' ) ) return;
   
       // assure the post type
       if ( ! get_post_type($post_id) == 'cards' ) return;
   
       // assure the data are sended by the form
       if (
          ! isset($_POST['my_cards_activity']) ||
          ! isset($_POST['my_cards_datetime']) || ! isset('my_cards_user')
       ) return;
   
       $activity = $_POST['my_cards_activity'];
   
       // and now the simply logic
       if ( $activity == 1 ) {
           $datetime = $_POST['my_cards_datetime'];
           $user = $_POST['my_cards_user'];
       } else {
           $datetime = '';
           $user = '';    
       }
   
       // save data as array
       $meta_data = compact("activity", "datetime", "user");
       update_post_meta($post_id, 'card_data', $meta_data);
   
       // if you want can save data as 3 different meta fields in this case
       // delete the previous 2 lines and uncommente the following
       // update_post_meta($post_id, 'card_activity', $activity);
       // update_post_meta($post_id, 'datetime', $datetime);
       // update_post_meta($post_id, 'user', $user);        
   
   } 
   

   If in your metabox have you setted a nonce field check for it before save.

   See Codex for:

   • save_post action hook
   • get_post_type
   • update_post_meta

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