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Group use declarations

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

// 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\namesp...


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