form checking

[ainars]

I use this to check form:

if ($occupation != 0 AND $occupation != 1 AND $occupation != 2 AND $occupation != 3 AND $occupation != 4 AND $occupation != 5 AND $occupation != 6 AND $occupation != 7 AND $oppupation != 8 AND................... $occupation !=25) {
$occupation = "1";
}
else
{
$occupation = $occupation;
}

Is it possible to check form in shorter way without overwriting all allowed values... something like:

if occupation is not number in range 0-25
{
$occupation = "0";
}
else
$occupation = $occupation;
}

Thanks.

[cahva]

if ($occupation>=0 && $occupation<=25)
	$occupation=$occupation;
else
	$occupation=0;

[ainars]

thank you, cahva.