使一个数组被n整除？

Question

I have an array:

$arr = ['a', 'b', 'c', 'd', 'e', 'f', 'g'];

Is there a way to make it contain elements only divisible by 3 (or n)? So in the above example g would be removed as it's left over from a division of 3?

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EDIT

I want amount of elements divisible by 3.

Answer 1

You can use a combination of array_slice(), count() and modulus (%) to get the array evenly divisible:

$arr_length = count($arr);
$new_arr = array_slice($arr, 0, $arr_length - ($arr_length % 3));