uksort() works fine, thanks.

There seems to be a cut/paste mistake in the error-handling source
code which incorrectly refers to uasort instead of uksort, though:

In functions/basic_functions.c, near line 921, the bit about :
  if (!(array->type & IS_HASH)) {
    php3_error(E_WARNING, "Wrong datatype in uasort() call");
                                                                     ^^^^^^
    user_compare_func_name = old_compare_func;
    return;
  }
Should read instead:
  if (!(array->type & IS_HASH)) {
    php3_error(E_WARNING, "Wrong datatype in uksort() call");
    user_compare_func_name = old_compare_func;
    return;
  }

No big deal.