Warning che non so risolvere

[pezzo]

Ragazzi, ho ricevuto un warning che non so come risolvere...

Ecco la funzione incriminata:

function analyse_asf_file($file_name) {
 $props = array();
 $file = fopen($file_name, "rb");
 $guid = read_asf_guid($file);
 if($guid == GUID_ASF_HEADER) {
  $offset = 30;
  $chuck_length = read_asf_int64($file);
  $num_chunks = read_asf_long($file);
  $unknown = read_asf_short($file);
  for($i = 0; $i < $num_chunks; $i++) {
   fseek($file, $offset);
   $guid = read_asf_guid($file);
   $chuck_length = read_asf_int64($file);
   read_asf_header_chunk($file, $guid, &$props); //questa è la riga incriminata
   $offset += $chuck_length;
  }
 }
 fclose($file);
 return $props;

} 

ed ecco il warning:

Warning: Call-time pass-by-reference has been deprecated - argument passed by value; If you would like to pass it by reference, modify the declaration of [runtime function name](). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file. However, future versions may not support this any longer.


Che si fa?