Question

How to check if product of every adjacent pairs exists in an array with PHP

Answer 1

function check_product_of_every_pair($array) {
    for ($i = 0; $i < count($array); $i += 2) {
        $product = $array[$i] * $array[$i + 1];
        echo $array[$i] . " * " . $array[$i + 1] . " = " . $product . "\n";
        if (!in_array($product, $array)) {
            return false;
        }
    }
    
    return true;
}
        
$array = array(2, 3, 6, 5, 30, 0);

echo (check_product_of_every_pair($array) ? "Yes" : "No");



/*
run:

2 * 3 = 6
6 * 5 = 30
30 * 0 = 0
Yes

*/

 

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