Write a PHP program to find the larger from two given integers

<?php
function test($x, $y)
{
    if ($x == $y)
            {
                return 0;
            }
            else if (($x % 7 == $y % 7 && $x < $y) || $x > $y)
            {
                return $x;
            }
            else
            {
                return $y;
            }
}

echo test(11, 21)."\n";
echo test(11, 20)."\n";
echo test(10, 10)."\n";