93 lines
1.5 KiB
Markdown
93 lines
1.5 KiB
Markdown
---
|
|
title: Switch statement
|
|
---
|
|
|
|
# Switch
|
|
`Switch` is a selection statement that will select a switch statement and execute it from the list of candidates. Switch consists of `case` and an optional `default`. The execution can be stopped by using a `break` or `return`.
|
|
|
|
## Syntax
|
|
```
|
|
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
|
|
}
|
|
|
|
```
|
|
|
|
## Example
|
|
```php
|
|
|
|
<?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.'.';
|
|
|
|
?>
|
|
|
|
```
|
|
|
|
## Output
|
|
```
|
|
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.
|
|
```
|