I have the array, function my_multiply and the function array_walk
but the value start from 0 and the array is 1
the factor multiple the key and return the value
I think is working like this

$array2 = array(1,2,3);
function my_multiply(&$value,$key,$factor){
    $value *=$factor;
    echo "| value ".$value." | key ". $key." |factor ".$factor;
}
array_walk($array2,'my_multiply',3);
?>

| value 3 | key 0 |factor 3| value 6 | key 1 |factor 3| value 9 | key 2 |factor 3

    Not sure if this is what you are asking, but when you create an array like this...

    $array2 = array(1,2,3);

    ...the array will be numerically indexed, starting at 0, as if you did...

    $array2 = array(
    0 => 1,
    1 => 2,
    2 => 3
);

    Therefore, the first $key will be 0, while its associated $value will (initially) be 1.

      Also not sure what you want, but your own code is showing you that the values are being multiplied by 3 and the keys are unchanged. Nothing is being returned, but $array2 is having its values modified.

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