Best way to validate numbers (ids)?

JdS · #1 20-Jan-2003, 01:48

I was just wondering... how do YOU validate numbers (ids) in your PHP scripts?

I used to use :

PHP Code:


<?php

$pgid = ( !is_numeric($_GET['pg']) ? 0 : $_GET['pg'] );

?>

then I settled for :

PHP Code:


<?php

$pgid = ( !is_numeric($_GET['pg']) ? 0 : intval($_GET['pg']) );

?>

now I do mostly :

PHP Code:


<?php

$pgid = ( !preg_match('/^[0-9]+$/', $_GET['pg']) ? 0 : $_GET['pg'] );

?>

Garth Farley · #2 20-Jan-2003, 03:55

is_numeric() accepts double numbers, like "-234.45e-12" for example, but your preg emulates is_int().

I suppose it's good programming practice to use intval(), but it's not necessary. If the number is put into $pgid, and a numerical operation is applied to it, it will automatically be used as a int.

GF

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