Which PHP function uses such hash algorithm?

   1. static inline ulong zend_inline开发者_运维问答_hash_func(char *arKey, uint nKeyLength)
   2. {
   3.     register ulong hash = 5381;
   4.  
   5.     /* variant with the hash unrolled eight times */
   6.     for (; nKeyLength >= 8; nKeyLength -= 8) {
   7.         hash = ((hash << 5) + hash) + *arKey++;
   8.         hash = ((hash << 5) + hash) + *arKey++;
   9.         hash = ((hash << 5) + hash) + *arKey++;
  10.         hash = ((hash << 5) + hash) + *arKey++;
  11.         hash = ((hash << 5) + hash) + *arKey++;
  12.         hash = ((hash << 5) + hash) + *arKey++;
  13.         hash = ((hash << 5) + hash) + *arKey++;
  14.         hash = ((hash << 5) + hash) + *arKey++;
  15.     }
  16.     switch (nKeyLength) {
  17.         case 7: hash = ((hash << 5) + hash) + *arKey++; /* fallthrough... */
  18.         case 6: hash = ((hash << 5) + hash) + *arKey++; /* fallthrough... */
  19.         case 5: hash = ((hash << 5) + hash) + *arKey++; /* fallthrough... */
  20.         case 4: hash = ((hash << 5) + hash) + *arKey++; /* fallthrough... */
  21.         case 3: hash = ((hash << 5) + hash) + *arKey++; /* fallthrough... */
  22.         case 2: hash = ((hash << 5) + hash) + *arKey++; /* fallthrough... */
  23.         case 1: hash = ((hash << 5) + hash) + *arKey++; break;
  24.         case 0: break;
  25. EMPTY_SWITCH_DEFAULT_CASE()
  26.     }
  27.     return hash;
  28. }

All the hash tables use that hashing algorithm; hash tables in PHP are used, for instance, to implement arrays and symbol tables, among many other things.

The algorithm, as pointed in the header is DJBX33A (Daniel J. Bernstein, Times 33 with Addition).

You can use this link to see where this function is used: http://lxr.php.net/search?q=+zend_inline_hash_func&defs=&refs=&path=&hist=&project=PHP_5_4

looks like there are 3 php extensions (including standard) where this function is used.