bitly shortlink

gistfile1.txt

/**
 * Helper function to get the short url for a post
 *
 * @param int $post_id
 * @return string $url
 */
function time_get_bitly_url( $post_id = null ) {

	$post_id = empty( $post_id ) ? get_the_ID() : $post_id;
	
	return get_post_meta( $post_id, 'time_bitly_url', true );
}

/**
 * Filter to replace the default shortlink
 */
function time_bitly_shortlink( $shortlink, $id ) {
	
	$bitly = time_get_bitly_url( $id );
	
	if( $bitly ) $shortlink = esc_url( $bitly );
	
	return $shortlink;
}
add_filter( 'pre_get_shortlink', 'time_bitly_shortlink', 10, 2 );