数组合并问题，麻烦大佬来指点下

Question

Array
(
    [0] => Array
        (
            [title] => Array
                (
                    [0] => '标题'
                )
 
            [user] => Array
                (
                    [0] => 用户1
                    [1] => 用户2
                )
 
            [ct] => Array
                (
                    [0] => 回复1
                    [1] => 回复2
                )
 
            [time] => Array
                (
                    [0] => 2019-04-10 11:34:37
                    [1] => 2019-04-10 11:39:30
                )
 
        )
[1] => Array
        (
            [title] => Array
                (
                    [0] => 标题2
                )
 
            [user] => Array
                (
                    [0] => 用户3
                    [1] => 用户4
                )
 
            [ct] => Array
                (
                    [0] => 回复3
                    [1] => 回复4
                )
 
            [time] => Array
                (
                    [0] => 2019-04-10 11:06:30
                    [1] => 2019-04-10 11:22:57
                )
 
        )
        
    
    [0] => Array
(
    [id] => 735
    [title] => 标题2
)

[1] => Array

(
    [id] => 727
    [title] => 标题
)
      
      **想让他变成这样，根据title把id追加进数组里**
          Array
(
    [0] => Array
        (
            [id] => 727
            [title] => Array
                (
                    [0] => '标题'
                )
 
            [user] => Array
                (
                    [0] => 用户1
                    [1] => 用户2
                )
 
            [ct] => Array
                (
                    [0] => 回复1
                    [1] => 回复2
                )
 
            [time] => Array
                (
                    [0] => 2019-04-10 11:34:37
                    [1] => 2019-04-10 11:39:30
                )
 
        )
[1] => Array
        (
            [id] => 735
            [title] => Array
                (
                    [0] => 标题2
                )
 
            [user] => Array
                (
                    [0] => 用户3
                    [1] => 用户4
                )
 
            [ct] => Array
                (
                    [0] => 回复3
                    [1] => 回复4
                )
 
            [time] => Array
                (
                    [0] => 2019-04-10 11:06:30
                    [1] => 2019-04-10 11:22:57
                )
 
        )   

Answer 1

光靠 title相等 这个条件合并数组会有问题，会出现title重复，id分配第二次的情况