PHP multiply each value in the array by an additional argument [duplicate]

Question

I was trying to create a PHP function that multiplies the values/content of the array by a given argument.

Modify this function so that you can pass an additional argument to this function. The function should multiply each value in the array by this additional argument (call this additional argument 'factor' inside the function). For example say $A = array(2,4,10,16). When you say

$B = multiply($A, 5);  
var_dump($B);
this should dump B which contains [10, 20, 50, 80 ]

Here's my code so far:

$A = array(2, 4, 10, 16);

        function multiply($array, $factor){
            foreach ($array as $key => $value) {
                   echo $value = $value * $factor;
            }

        }

        $B = multiply($A, 6);
        var_dump($B);

Any idea? Thanks!

Answer 1

Your function is not right, It has to return that array and not echo some values.

    function multiply($array, $factor)
    {
        foreach ($array as $key => $value)
        {
                  $array[$key]=$value*$factor;
        }
        return $array;
    }

Rest is fine.

Fiddle

You can even do this with array_map

$A = array(2, 4, 10, 16);
print_r(array_map(function($number){return $number * 6;}, $A));

Fiddle