Hello all, im new here so bare with me

This is what i have:

$queryzoeken = ("SELECT SNR, SNM, SOMS, SVER, SSER, SLEV, SLIC, SLM
FROM software
WHERE SNR = $array[snr]

(!!if $array[snr is filled in then also look use it in the query!!)

AND snm = $array[snr]");


$result = mysql_query( $queryzoeken);

Explanation: User inputs one or more of these variables:
$array[snr]
$array[snm]
etc.


I need the server to look up the query with tha variables the use has
filled in, and leave out the ones that are empty.

Can anyone help me out with this?