public function getKeys($keys = [])
    {
        $allKeys = $this->reader->keys();

        return array_filter($allKeys, function ($key) use ($keys) {
            if (!empty($keys)) {
                return in_array($key, $keys);
            }
            return true;
        }, ARRAY_FILTER_USE_KEY);
    }
public function getKeys($keys = [])
    {
        $allKeys = $this->reader->keys();

        return array_filter($allKeys, function ($key) use ($keys) {
            if (!empty($keys)) {
                return in_array($key, $keys);
            }
            return true;
        }, ARRAY_FILTER_USE_KEY);
    }
public function getKeys ( $ keys = [ ] ) { $ allKeys = $ this -> reader -> keys ( ) ; return array_filter ( $ allKeys , function ( $ key ) use ( $ keys ) { if ( ! empty ( $ keys ) ) { return in_array ( $ key , $ keys ) ; } return true ; } , ARRAY_FILTER_USE_KEY ) ; }
Get all or exists given keys in file content

@param  array  $keys

@return array
Get all or exists given keys in file content