Divide array by golden ratio

divide_array_by_golden_ratio.php

<?php
function divide_array_by_golden_ratio($arr)
{
    $ab = count($arr);
    if ($ab < 2)
    {
        return false;
    }
    $phi = (1 + sqrt(5)) / 2;
    $a = round($ab / $phi);
    $b = $ab - $a;
    $arr_a = array_slice($arr, 0, $a);
    $arr_b = array_slice($arr, $a, $b);
    return array($arr_a, $arr_b);
}
?>