按对象数组

Question

如何按林名或树高例法对此数组进行排序：
森林名称是＆＃34;森林湖＆＃34;和＃34;中央森林＆＃34;所以城市将是 按照他们的森林排序，所以City Object＆＃34; Pogradec＆＃34;将是第一个而不是地拉那＆＃34;，
根据树木的高度，它们应该在森林内进行分类，并且还要 树木最高的城市应该是第一位的。 ：

Array
(
    [0] => City Object
        (
            [name] => Tirana
            [forests] => Array
                (
                    [0] => Forest Object
                        (
                            [name] => Lake Forest
                            [details] => Array
                                (
                                    [0] => Tree Object
                                        (
                                            [name] => Black Ash
                                            [height] => 5                                   
                                        )

                                    [0] => Tree Object
                                        (
                                            [name] => White Ash
                                            [height] => 7

                                         )
                                )   
                        )   
                )    
        )

    [1] => City Object
        (
            [name] => Pogradec
            [forests] => Array
                (
                    [0] => Forest Object
                        (
                            [name] => Central Forest
                            [details] => Array
                                (
                                    [0] => Tree Object
                                        (
                                            [name] => Black Ash
                                            [height] => 13
                                        )

                                    [1] => Tree Object
                                        (
                                            [name] =>White Ash
                                            [height] => 23
                                        )
                                )
                        )
                )
        )
)