[PHP] fread error

[Don]

Hi,

Using a a flat text file based calendar script.
Started getting this error after upgrading PHP:

Warning: fread(): Length parameter must be greater than 0

Function it is occurring in is:

function read_str($fp)
   {
   $strlen = $this->bin2dec(fread($fp,4),4);
   return fread($fp, $strlen);
   }

Any ideas?

Thanks,
Don