Custom Merge Tags - snippet.farm

<?php // Introduce additional merge tags for use throughout Gravity Forms
add_filter( 'gform_replace_merge_tags', function ( $text, $form, $entry, $url_encode, $esc_html, $nl2br, $format ) {

   $custom_merge_tags = array(
      '{date_ymd}'  => date( 'Y.m-M.d', strtotime( $entry['date_created'] ) ),
      '{timestamp}' => time(),
      '{site_url}'  => get_site_url(),
      '{site_name}' => get_bloginfo( 'name' )
   );
    
   return str_replace( array_keys( $custom_merge_tags ), array_values( $custom_merge_tags ), $text);

}, 10, 7 );

// Add our custom merge tags to the dropdown
add_action( 'admin_print_scripts', function () {

   if ( method_exists( 'GFForms', 'is_gravity_page' ) && GFForms::is_gravity_page() ) { ?>

      <script type="text/javascript">
         gform.addFilter('gform_merge_tags', function (mergeTags, elementId, hideAllFields, excludeFieldTypes, isPrepop, option) {
             mergeTags["custom"].tags.push({ tag: '{date_ymd}', label: 'Entry Date (Y.m-M.d)' });
             mergeTags["custom"].tags.push({ tag: '{timestamp}', label: 'Current Time (UNIX Timestamp)' });
             mergeTags["custom"].tags.push({ tag: '{site_url}', label: 'Site URL' });
             mergeTags["custom"].tags.push({ tag: '{site_name}', label: 'Site Name' });
             return mergeTags;
          } );
      </script>

   <?php }

 } );