What is the use of switch statement in php

[zeeshan]

what do switch statement does i did not understand it and does it has any use in login script?

[boen_robot]

PHP is not just about logins you know. It can do far more.The switch statement compares the value of a single variable against other values. You can use it to define different actions for different values of a variable. For example, if you have the fileindex.php

<?phpswitch($_GET['number']) {	case '1':		//What to do if $_GET['number'] === '1'		$entered = 'one';		break;	case '4':		//What to do if $_GET['number'] === '4'		$entered = 'four';		break;	case '6':		//What to do if $_GET['number'] === '6'		$entered = 'six';		break;	default:		//What to do if $_GET['number'] is anything else, or is not present		$entered = 'not recognized';		break;}echo "The number you entered is $entered";?>

and access it like

index.php?number=1

you'll see

The number you entered is one

and if you access it like

index.php?number=4

you'll instead see

The number you entered is four

and if accessed like

index.php?number=6

the script would say

The number you entered is six

In all other cases, you'll see

The number you entered is not recognized

The switch statement is a good replacement (and I think more efficient in some cases) for a series of if...elseif statements comparing the same variable. For example, the above script could be rewritten to

<?phpif ($_GET['number'] === '1') {	//What to do if $_GET['number'] === '1'	$entered = 'one';}elseif ($_GET['number'] === '4') {	//What to do if $_GET['number'] === '4'	$entered = 'four';}elseif ($_GET['number'] === '6') {	//What to do if $_GET['number'] === '6'	$entered = 'six';}else {	//What to do if $_GET['number'] is anything else, or is not present	$entered = 'not recognized';}echo "The number you entered is $entered";?>

but the switch() is just nicer.