PHP combinations of array elements -

i want generate possible combination of array elements fill placeholder, placeholder size vary.

let have array $a = array(3, 2, 9, 7) , placeholder size 6. want generate following:

3,3,3,3,3,3 2,3,3,3,3,3 2,2,3,3,3,3 ........... ........... 7,7,7,7,7,9 7,7,7,7,7,7

however (2,3,3,3,3,3) considered same (3,2,3,3,3,3) later 1 doesn't count.

could point me right direction? know there math_combinatorics pear package, 1 applicable placeholder size <= count($a).

edit thinking 1 similar bits string combination though different number base

i have no php source code sources might help.

wiki article here

KHS