static inline ulong zend_inline_hash_func(const char *arKey, uint nKeyLength)
{
  register ulong hash = 5381;

  /* variant with the hash unrolled eight times */
  for (; nKeyLength >= 8; nKeyLength -= 8) {
    hash = ((hash << 5) + hash) + *arKey++;
    hash = ((hash << 5) + hash) + *arKey++;
    hash = ((hash << 5) + hash) + *arKey++;
    hash = ((hash << 5) + hash) + *arKey++;
    hash = ((hash << 5) + hash) + *arKey++;
    hash = ((hash << 5) + hash) + *arKey++;
    hash = ((hash << 5) + hash) + *arKey++;
    hash = ((hash << 5) + hash) + *arKey++;
  }
  switch (nKeyLength) {
    case 7: hash = ((hash << 5) + hash) + *arKey++; 
    case 6: hash = ((hash << 5) + hash) + *arKey++;
    case 5: hash = ((hash << 5) + hash) + *arKey++;
    case 4: hash = ((hash << 5) + hash) + *arKey++;
    case 3: hash = ((hash << 5) + hash) + *arKey++;
    case 2: hash = ((hash << 5) + hash) + *arKey++;
    case 1: hash = ((hash << 5) + hash) + *arKey++; break;
    case 0: break;
  }
  return hash;
}