how to generate all sub-array of an array

[trungtan]

Hi everyone,

I need to generate all sub-array from an array.

For example:
source_array = array("a", "b", "c", "d");

so the result is:
array(

array("a"), array("b"), array("c"), array("d"),
array("a", "b"), array("a", "c"), array("a", "d"),
array("b", "c"), array("b", "d"),
array("c", "d"),

array("a", "b", "c"), array("a", "b", "d"),
array("a", "c", "d"),
array("b", "c", "d"),

array("a", "b", "c", "d")
)

Please suggest me a good way to do that! Thanks all guys!

[seandisanti]

What you're trying to generate, it sounds like, are all permutations of an array. Search for that phrase on the forum and I think you'll find what you're looking for