php/php-src — pull request #543 by datibbaw (2013-12-12 02:36:21+00:00)
Title: Power function as an operator.

This PR complements the [pow-operator](https://wiki.php.net/rfc/pow-operator) proposal, which will soon reach its voting phase.

The power operator allows expressions, like:

echo 2 ** 3; // 8
$x = 2;
echo $x **= 3; // 8

It also supports GMP overloading:

$x = gmp_init(2) ** 3;
var_dump($x instanceof GMP); // bool(true)