Ouzo\Tests\ArrayAssert::extracting PHP Method

    public function extracting()
    {
        $selectors = func_get_args();
        $actual = array();
        if (count($selectors) == 1) {
            $selector = Arrays::first($selectors);
            $actual = Arrays::map($this->actual, Functions::extractExpression($selector, true));
        } else {
            foreach ($this->actual as $item) {
                $extracted = array();
                foreach ($selectors as $selector) {
                    $extracted[] = Functions::call(Functions::extractExpression($selector, true), $item);
                }
                $actual[] = $extracted;
            }
        }
        return self::that($actual);
    }