1.5 KiB
1.5 KiB
title | localeTitle |
---|---|
Switch statement | 切换声明 |
开关
Switch
是一个选择语句,它将选择一个switch语句并从候选列表中执行它。 Switch由case
和可选的default
。可以使用break
或return
来停止执行。
句法
switch(x)
{
case value1:
//execute if x = value1
break;
case value2:
//execute if x = value2
break;
...
default:
execute if x is different with cases above
}
例
<?php
//initialize with a random integer within range
$diceNumber = mt_rand(1, 6);
//initialize
$numText = "";
//calling switch statement
switch($diceNumber)
{
case 1:
$numText = "One";
break;
case 2:
$numText = "Two";
break;
case 3:
case 4:
// case 3 and 4 will go to this line
$numText = "Three or Four";
break;
case 5:
$numText = "Five";
echo $numText;
// break; //without specify break or return it will continue execute to next case.
case 6:
$numText = "Six";
echo $numText;
break;
default:
$numText = "unknown";
}
//display result
echo 'Dice show number '.$numText.'.';
?>
产量
if case is 1
> Dice show number One.
if case is 2
> Dice show number Two.
if case is 3
> Dice show number Three or Four.
if case is 4
> Dice show number Three or Four.
if case is 5
> FiveSixDice show number Six.
if case is 6
> SixDice show number Six.
if none of the above
> Dice show number unknown.