PHP: Can I reference a single member of an array that is returned by a function?

any idea how if the following is possible in PHP as a single line ?:

<?php
$firstElement = functionThatReturnsAnArray()[0];

... It doesn't seem to 'take'. I need to do this as a 2-stepper:

<?php
$allElements = functionThatReturnsAnArray();
$firstElement = $allElements[0];

... just curious - other languages I play with allow things like this, and I'm lazy enoug to miss this in PHP ... any insight appreciated ...