Is there a way to define a default caption to all uploaded images

1 comment

1. There’s really no documentation for it yet, but you’ll probably be able to do it hooking to the attachment_fields_to_save filter and inserting the default caption there.

   From the Codex:

   attachment_fields_to_save
   applied to fields associated with an
   attachment prior to saving them in the database. Called in the
   media_upload_form_handler function. Filter function arguments: an
   array of post attributes, an array of attachment fields including the
   changes submitted from the form

   It is defined on wp-admin/includes/media.php:

   // TESTED :)
   function wpse300512_image_attachment_fields_to_save($post, $attachment) {
   if ( substr($post['post_mime_type'], 0, 5) == 'image' ) {
       if ( '' === trim( $post['post_title'] ) ) {
           $post['post_title'] = preg_replace('/.w+$/', '', basename($post['guid']));
           $post['errors']['post_title']['errors'][] = __('Empty Title filled from filename.');
       }
       // captions are saved as the post_excerpt, so we check for it before overwriting
       if ( '' === trim( $post['post_excerpt'] ) ) {
           $post['post_excerpt'] = 'default caption';
       }
   }
   
   return $post;
   }
   
   add_filter('attachment_fields_to_save', 'wpse300512_image_attachment_fields_to_save', 10, 2);
   

   UPDATE:
   I managed to test it, and it works as is. Just drop it on your functions.php 🙂

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