Idea of new operator in PHP

gistfile1.md

Got an idea of a new assignment operator ?= in PHP.

Instead of writing

if (!$x)
    $x = $y;

one could use ?= and write

$x ?= $y;

Example

function getCurrencyRate(Currency $currency, \DateTime $time = null)
{
    $time ?= new \DateTime('now');

    ...
}