PHP return语句的另一个作用

<?php
02 require_once('./bb-load.php');
03
04 bb_repermalink(); // The magic happens here.
05
06 if ( $self ) {
07 if ( strpos($self, '.php') !== false ) {
08 require($self);
09 } else {
10 require( BB_PATH . 'profile-base.php' );
11 }
12 return;
13 }