On 29 May 2012 18:15, Gary <[email protected]> wrote:
> Okay, let's assume I have three "things", A, B, and C. I need to produce
> an array with a list of all possible combinations of them, however many
> there might be in those combinations: e.g. A, B, C, D, AB, AC, AD, BC,
> ABC (not sure if I've missed any!). Normally I'm pretty good at working
> this stuff out, but to be honest I'm struggling with this one, at least
> to do it in any kind of elegant way. Does anyone have any ideas?
>
> Idealy what I'd like is a multidimensional array depending on the number
> of "things" in the combination. Something like:
> array(2) {
> [0]=>
> array(3) {
> [0]=>
> array(1) {
> ["name"]=>
> string(7) "A"
> }
> [1]=>
> array(2) {
> ["name"]=>
> string(5) "B"
> }
> [2]=>
> array(2) {
> ["name"]=>
> string(4) "C"
> }
> }
> [1]=>
> array(...) {
> [0]=>
> array(2) {
> ["name"]=>
> string(13) "A+B"
> }
> [1]=>
> array(2) {
> ["name"]=>
> string(12) "A+C"
> }
> (etc.)
>
>
>
If you are using linux, you can use the following:
$a = shell_exec("echo {a,b,c,d} && echo {a,b,c,d}{a,b,c,d} && echo
{a,b,c,d}{a,b,c,d}{a,b,c,d} && echo {a,b,c,d}{a,b,c,d}{a,b,c,d}{a,b,c,d}");
This will give you one line for 1 character combination, 1 line for 2
character combination and so on. You can then use explode to convert each
line to arrays.
Thanks,
Vikash
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