math

[kenny873]

if I have a variable $check20Multi

and I want to check if $check20Multi falls in the multiple of 20, that is, check if it is 20, 40, 60, 80 .... 2000

how can I do it....

because I want to do the following:

if $check20Multi is equal to A Multiple of 20

then $totalpage = $totalpage + 1;

[laserlight]

You can use the modulo operator, which returns the remainder of a division operation.

For example,
$num = 30
$num % 20 == 10

As such,

if ($check20Multi % 20 == 0)
//$check20Multi is a multiple of 20