break用法

break 结束当前 for，foreach，while，do..while 或者 switch 结构的执行。 <br />
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break 可以接受一个可选的数字参数来决定跳出几重循环。 <br />
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<?php<br />
$arr = array ('one', 'two', 'three', 'four', 'stop', 'five');<br />
while (list (, $val) = each ($arr)) {<br />
if ($val == 'stop') {<br />
break; /* You could also write 'break 1;' here. */<br />
}<br />
echo "$val<br>
";<br />
}<br />
<br />
/* Using the optional argument. */<br />
<br />
$i = 0;<br />
while (++$i) {<br />
switch ($i) {<br />
case 5:<br />
echo "At 5<br>
";<br />
break 1; /* Exit only the switch. */<br />
case 10:<br />
echo "At 10; quitting<br>
";<br />
break 2; /* Exit the switch and the while. */<br />
default:<br />
break;<br />
}<br />
}<br />
?>