Require a featured image to publish post

1 comment

1. You can do something like this with the hook pre_post_update :

   function wpse_108013_mandatory_featured_image() {
    if(!has_post_thumbnail()) { // here you check if there's a featured image
         wp_die( 'Featured image must always be set !' ); // there is no featured image
    } 
   }
   add_action( 'pre_post_update', 'wpse_108013_mandatory_featured_image' );
   

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