Display data encoded as UTF-8 strings

cvtlog.php

#!/usr/bin/php
<?php
//---------------------------------------------------------------------
//  Display data encoded as UTF-8 strings
//
//      Usage： tail -f log-files-etc | cvtlog.php
//---------------------------------------------------------------------
function    pack_func($matches) // $matches[] = array('\xXX', '\xXX');
{
   $tmp = sscanf('0' . substr($matches[0], 1), "%x");
   $digit = $tmp[0];
   $packed = pack('C', $digit);
   return  $packed;
}
while ($line = fgets(STDIN))   {
   print preg_replace_callback('/\\\x[0-9a-f]{2}/', 'pack_func', $line);
}