Re: Too many arrays! My head is exploding!

Le 29/05/2012 14:45, Gary a écrit :

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.) --

Gary        Please do NOT send me 'courtesy' replies off-list.

Enjoy ! function combinations($letters) {

    $combinations = array(array());
    foreach ($letters as $letter) {
      foreach ($combinations as $combination) {
        $combinations[] = array_merge($combination, array($letter));
      }
    }
    return $combinations;

} print"<pre>";print_r(combinations(array('a','b','c')));print"</pre>"; outputs : Array (

    [0] =>  Array
        (
        )

    [1] =>  Array
        (
            [0] =>  a
        )

    [2] =>  Array
        (
            [0] =>  b
        )

    [3] =>  Array
        (
            [0] =>  a
            [1] =>  b
        )

    [4] =>  Array
        (
            [0] =>  c
        )

    [5] =>  Array
        (
            [0] =>  a
            [1] =>  c
        )

    [6] =>  Array
        (
            [0] =>  b
            [1] =>  c
        )

    [7] =>  Array
        (
            [0] =>  a
            [1] =>  b
            [2] =>  c
        )

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