PHP flow control break statement

<?php
$arr = array(&#39;one&#39;, &#39;two&#39;, &#39;three&#39;, &#39;four&#39;, &#39;stop&#39;, &#39;five&#39;);
while (list (, $val) = each($arr)) {
    if ($val == &#39;stop&#39;) {
        break;    /* You could also write &#39;break 1;&#39; here. */
    }
    echo "$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;
    }
}
?>