PHP equivalent javascript >>> shift right with zero fill bitwise operators?

Question

May I know how can I do PHP >>> ? Such operators is not available in PHP, but is available in Javascript.

I just managed to discover a function as follow:

Answer 1

For both 32-bit (PHP_INT_SIZE == 4) and 64-bit integers (PHP_INT_SIZE == 8):

function SHR
($x, $c)
{
    $x = intval ($x); // Because 13.5 >> 0 returns 13. We follow.

    $nmaxBits = PHP_INT_SIZE * 8;
    $c %= $nmaxBits;

    if ($c)
        return $x >> $c & ~ (-1 << $nmaxBits - $c);
    else
        return $x;
}