4 digit number

[pradeepjain]

Hii guys,
I am generating a ID for students and i want the Id to be 4 digit always .....I keep incrementing the ID's .so it must automatically put 0's behind the number to make it 4 digit....How to do it...

[bnashenas1984]

Hi
You can not use a numerical variable because PHP will automaticaly delete extra zeros on the left side of your variable.

But you can use a string like this:

<?PHP
	$var=123;
	$fourDigit = trim($var);
	for ($i=0; $i<=3; $i++) {
		if (strlen($fourDigit) < 4) {$fourDigit = "0".$fourDigit;}
	}
	echo $fourDigit;
?>

The length of your string will allways be 4 as long as you use numbers less than 10000

Hope it helps

[Atli]

Why don't you just start counting at 1000?

Or, if you are using a database, like MySQL, you can have the database automatically add zeros to have the number fill a given length.

From the MySQL manual:

When used in conjunction with the optional extension attribute ZEROFILL, the default padding of spaces is replaced with zeros. For example, for a column declared as INT(5) ZEROFILL, a value of 4 is retrieved as 00004.

[pradeepjain]

thank you bnashenas1984.t hat worked for me..i was using a similar kind of script but for 0 i was not using "0" i was just using 0 that caused me problem.


thanks,
Pradeep