collection = new Collection( $items ); $this->unique_values = $unique_values; } /** * Since this class is a wrapper, every call will be forwarded to wrapped class. * Most of the collection methods returns a new collection instance, and therefore * it will be assigned as the current collection instance after executing any method. * * @param string $name * @param array $arguments */ public function __call( $name, $arguments ) { $call = call_user_func_array( [ $this->collection, $name ], $arguments ); if ( $call instanceof Collection ) { $this->collection = $this->unique_values ? $call->unique() : $call; } return $call; } }