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openstamanager/modules/combinazioni_articoli/modutil.php

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<?php
/**
* Genera il prodotto cartesiano tra gli elementi dell'array di input.
*
* @param $input
*
* @return array|array[]
*/
function cartesian($input)
{
$result = [[]];
foreach ($input as $key => $values) {
$append = [];
foreach ($result as $product) {
foreach ($values as $item) {
$product[$key] = $item;
$append[] = $product;
}
}
$result = $append;
}
return $result;
}