<?php

 $arr = array('one', 'two', 'three', 'four', 'stop', 'five');

 while (list (, $val) = each($arr)) {

     if ($val == 'stop') {

         break;    /* You could also write 'break 1;' here. */

     }

     echo "$val<br />\n";

 }

 /* 使用可选参数 */

 $i = 0;

 while (++$i) {

     switch ($i) {

     case 5:

         echo "At 5<br />\n";

         break 1;  /* 只退出 switch. */

     case 10:

         echo "At 10; quitting<br />\n";

         break 2;  /* 退出 switch 和 while 循环 */

     default:

         break;

     }

 }

 ?>