Group use declarations

Classes, functions, and constants, which are in the same namespace, can now imported in a single use statement. Previously, multiple use statements were required for that. Here is an example to understand it better:

<?php
// use statement in Pre-PHP7 code
use abc\namespace\ClassA;
use abc\namespace\ClassB;
use abc\namespace\ClassC as C;

use function abc\namespace\funcA;
use function abc\namespace\funcB;
use function abc\namespace\funcC;

use const abc\namespace\ConstA;
use const abc\namespace\ConstB;
use const abc\namespace\ConstC;

// PHP 7+ code
use abc\namespace\{ClassA, ClassB, ClassC as C};
use function abc\namespace\{funcA, funcB, funcC};
use const abc\namespace\{ConstA, ConstB, ConstC};

As you can see from this example, how convenient the group use statement is, it is clearly visible. Curly braces with comma separated values are used to group values such as {classA, classB, classC as C}, resulting in the grouped use statement, instead of separately using...