<?php

xdebug_start_code_coverage(XDEBUG_CC_UNUSED | XDEBUG_CC_DEAD_CODE);

class A {
    public function test(...$a) {
        print_r($a);
    }

    public function works($a) {
        echo $a;
    }
}

function works(...$a) {
    print_r($a);
}

(new A)->test('hi');

(new A)->works('hi');

works('hi');

xdebug_stop_code_coverage(false);

var_dump(xdebug_get_code_coverage());