reverse_array.php

<?php

function reverseArray($a) {
    $len = count($a);
    $i = 0;
    $res = [];
    while ($i < $len) {
        $j = abs($i - $len) - 1;
        $res[] = $a[$j];
        $i++;
    }
    return $res;
}

print_r(reverseArray([1, 4, 5, 2, 5, 9, 2, 4, 7, 0]));