How can I ksort() an array?
The default implementation does basically this:
zend_hash_sort(Z_ARRVAL_P(array), zend_qsort, php_array_key_compare, 0
TSRMLS_CC) but php_array_key_compare() is static in ext/standard/array.c 
Actually I wouldn't need to sort by key at all if add_index_zval() would
put the zval at the "right"  place from the beginning. Is there any
better alternative to add_index_zval() in this regard?
Preferably without going through the hassle of making a round-trip via
zend_call_function() "directly" to zif_ksort().
What I need is to zend_hash_move_forward() & co but to get the elements
in the order indicated by the numeric indeces.
 I know the HT implementation is made to be generalized enough for
other use cases, and as such, there is no "right" order. Thus I'm
thinking maybe there's some way to add a new numerically-indexed element
to the HT and "teach" the HT to do the bookkeeping in respect to the
numeric order. Or maybe a better way to iterate such an array.
What I cannot create, I do not understand. -- Feynman