Generate a 2d array of all two-element combinations from a flat array

Question

I am not sure how to exactly explain what I am trying to do but I try to explain using an example.

$products = array("35","37","43");

Say if I have above array how can I create a result array that will look like this.

$related_products = array (
    array (35,37),
    array (35,43),
    array (37,35),
    array (37.43),
    array (43,35),
    array (43, 37)
)

Answer 1

You could use two loops to catch all combinations:

$products = array("35","37","43");
$result = array();
for($i = 0; $i < count($products); $i++) {
    for($j = 0; $j < count($products); $j++) {
        if($i !== $j) {
            $result[] = array(
                $products[$i],
                $products[$j]
            );
        }   
    }
}

print_r($result);

Result:

Array
(
    [0] => Array
        (
            [0] => 35
            [1] => 37
        )

    [1] => Array
        (
            [0] => 35
            [1] => 43
        )

    [2] => Array
        (
            [0] => 37
            [1] => 35
        )

    [3] => Array
        (
            [0] => 37
            [1] => 43
        )

    [4] => Array
        (
            [0] => 43
            [1] => 35
        )

    [5] => Array
        (
            [0] => 43
            [1] => 37
        )

)