<?php
function tribe_ext_gf_event_merge_tag( $text, $url_encode = false, $entry = false, $esc_html = false, $form = false, $nl2br = false, $format = 'html' ) {

	preg_match_all( "/\{tribe_event:(.*?)\}/", $text, $event_matches, PREG_SET_ORDER );
	if ( ! empty( $event_matches ) ) {
		global $post;
		$post_array = GFCommon::object_to_array( $post );
		$event_id   = $post_array['ID'];

		//custom_field
		foreach ( $event_matches as $match ) {
			$full_tag           = $match[0];
			$custom_field_name  = $match[1];
			$custom_field_value = get_post_meta( $event_id, $custom_field_name, true );

			// Only look at the Venue and Organizer if you didnt find anything at the event PostMeta
			if ( ! $custom_field_value ) {

				// Look at the Venue Data
				if ( 0 === strpos( $custom_field_name, '_Venue' ) ) {
					$venue_id = get_post_meta( $event_id, '_EventVenueID', true );


					// Only Try if we have a Venue
					if ( $venue_id ) {
						$custom_field_value = get_post_meta( $venue_id, $custom_field_name, true );
					}
				// Look at the Organizer Data
				} elseif ( 0 === strpos( $custom_field_name, '_Organizer' ) ) {
					$organizer_id = get_post_meta( $event_id, '_EventOrganizerID', true );

					// Only Try if we have an Organizer
					if ( $organizer_id ) {
						$custom_field_value = get_post_meta( $organizer_id, $custom_field_name, true );
					}
				}

			}

			$text = str_replace( $full_tag, $url_encode ? urlencode( $custom_field_value ) : $custom_field_value, $text );
		}
	}

	return $text;
}