Reading 16 Bit Wav File

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hi! i'm having problem reading 16 bit wav files with php and it is starting to drive me crazy!
i have written a small and simple script that will read wav file and create graph from it.
now, it works as it should with 8 bit wav files. i'm getting all data as i'm supose to, but when it comes to 16 bit files i'm getting crap.
i thought that in wav file you read chuncks as it is marked in header - so at 8 bit wav chunck is 8 bit long, at 16 bit wav 16 bit...
anyway, here is part of the script where i read wav and put that in array:

PHP Code:

$filename = $_GET['wav'];     $handle = fopen ($filename, "r");     //dohvačanje zaglavlja wav datoteke         //here i read wav headers     $zaglavlje[] = bin2hex (fread ($handle, 4));     $zaglavlje[] = bin2hex (fread ($handle, 4));     $zaglavlje[] = bin2hex (fread ($handle, 4));     $zaglavlje[] = bin2hex (fread ($handle, 4));     $zaglavlje[] = bin2hex (fread ($handle, 4));     $zaglavlje[] = bin2hex (fread ($handle, 2));     $zaglavlje[] = bin2hex (fread ($handle, 2));     $zaglavlje[] = bin2hex (fread ($handle, 4));     $zaglavlje[] = bin2hex (fread ($handle, 4));     $zaglavlje[] = bin2hex (fread ($handle, 2));     $zaglavlje[] = bin2hex (fread ($handle, 2));     $zaglavlje[] = bin2hex (fread ($handle, 4));     $zaglavlje[] = bin2hex (fread ($handle, 4));          //bitrate wav datoteke         //this is wav bitrate     $peek = hexdec(substr($zaglavlje[10], 0, 2));          //provjera da li se radi o mono ili stereo wavu         //here i check if it's stereo or mono wav     $kanala = hexdec(substr($zaglavlje[6], 0, 2));     if($kanala == 2){         $omjer = 20;     }     else{         $omjer = 40;     }          //čitanje podataka iz datoteke - čita se samo 600 elemenata za mono wav ili 1200 za stereo radi utede na memoriji i procesorskom vremenu     while(!feof($handle)){                 //read number of bytes determend by bitrate         $bps = fread($handle, $peek / 8);         if(strlen($bps) == 0){             break;         }                 //put value of wav chunk in array         $data[] = hexdec(bin2hex($bps));                 //skip some chunks for memory optimization         fread($handle, ($peek / 8) * $omjer);     }     fclose ($handle);  

i'm doing something wrong with reading wavs just i don't knaw what!

thanx for any help!