PHP nested foreach to create something like Cartesian Product

Asked Feb 12 '14 at 20:33

Active Feb 12 '14 at 20:49

Viewed 68 times

I've ran into a problem while creating a script on PHP. I have 3 arrays styles, colors and sizes (this is the order). I need to combine values between them to get something like a Cartesian Product. 3 imbricated foreachs should help, but any (or even all) can be empty. How to combine them corectly?

Ex:

$styles = array('formal', 'dressy');
$colors = array();
$sizes = array(16, 18);

The result should be:

$res = array(
    array('style' => 'formal', 'size' => 16),
    array('style' => 'formal', 'size' => 18),
    array('style' => 'dressy', 'size' => 16),
    array('style' => 'dressy', 'size' => 18),
);

If $colors weren't empty, then between style and size should be the color. How can I achieve this?

edited Feb 12 '14 at 20:49

asked Feb 12 '14 at 20:33

Marin Bînzari

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What would the output look like if there were more than one size? – snollygolly Feb 12 '14 at 20:34
Can any of the nested arrays have more than one style, size, or color? – user2278120 Feb 12 '14 at 20:42
@SLoW, added another size. user2278120, I need 'Cartesian Product', this means that in $res it shoulb be one and only one value from each array! – Marin Bînzari Feb 12 '14 at 20:51
@VictorStanciu, Tested the code from that anwer and it does what I need. When I found it I didn't test it. – Marin Bînzari Feb 12 '14 at 21:02

PHP nested foreach to create something like Cartesian Product

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