Help with php maths syntax

[ad_aus]

Hi, I'm relatively new to php. I got stuck on syntax to perform some calculations on server side. In particular, I'm trying to calculate a log and round the number to 0 decimal places, here are the details but I can't get it to work:

<? php
$q = 360/$_POST['thenumber'];

$z= round(float log(float$q [, 2]));

?>

$_POST['thenumber'] is a number from a form passed to a current page (well, should be a number...)
I need to divide 360 by 'thenumber'

returned $q variable to be used in logarthmic calculation - base 2
$z variable to be the whole number only (to be used in another part of the script)

Any assistance much appreciated.

[Installer]

$q = 360 / $_POST['thenumber'];
$z = round(log($q, 2));

[ad_aus]

Of course, silly me :-)

Thanks Installer!