336 /**

   337  * Decodes a hex string.

   338  * @param string $hex The hex code to decode

   339  * @return string

   340  */

   341 

   342 function hexdecode($hex)

   343 {

   344   $hex = str_split($hex, 2);

   345   $bin_key = '';

   346   foreach($hex as $nibble)

   347   {

   348     $byte = chr(hexdec($nibble));

   349     $bin_key .= $byte;

   350   }

   351   return $bin_key;

   352 }

   353