How does the PHP array have the same CID transform and add new fields to the two-dimensional array?

Array:

Array(    [0] => Array        (            [id] => 1            [menu_collapse] => 超级菜单            [menu_items] => 写文章            [cid] => 1                 )    [1] => Array       (            [id] => 2            [menu_collapse] => 维护菜单            [menu_items] => 管理数据            [cid] => 2                 )    [2] => Array       (            [id] => 3            [menu_collapse] => 维护菜单            [menu_items] => 管理用户            [cid] => 2                 ))

How do I convert the above array to this?

Array(    [0] => Array        (            [id] => 1            [menu_collapse] => 超级菜单            [menu_items] => 写文章            [cid] => 1                 )    [1] => Array       (        [new] => Array                   (                        [id] => 2                        [menu_collapse] => 维护菜单                        [menu_items] => 管理数据                        [cid] => 2                                         )                 (                        [id] => 2                        [menu_collapse] => 维护菜单                        [menu_items] => 管理数据                        [cid] => 2                                        ))

Reply content:

Array:

Array(    [0] => Array        (            [id] => 1            [menu_collapse] => 超级菜单            [menu_items] => 写文章            [cid] => 1                 )    [1] => Array       (            [id] => 2            [menu_collapse] => 维护菜单            [menu_items] => 管理数据            [cid] => 2                 )    [2] => Array       (            [id] => 3            [menu_collapse] => 维护菜单            [menu_items] => 管理用户            [cid] => 2                 ))

How do I convert the above array to this?

Array(    [0] => Array        (            [id] => 1            [menu_collapse] => 超级菜单            [menu_items] => 写文章            [cid] => 1                 )    [1] => Array       (        [new] => Array                   (                        [id] => 2                        [menu_collapse] => 维护菜单                        [menu_items] => 管理数据                        [cid] => 2                                         )                 (                        [id] => 2                        [menu_collapse] => 维护菜单                        [menu_items] => 管理数据                        [cid] => 2                                        ))

 $arr = [[' id ' = + 1, ' menu_collapse ' = ' + ' super menu ', ' menu_items ' = ' = ' Write the article ', ' CID ' = 1,], [' id ' = + 2, ' menu_collapse ' = ' maintenance menu ', ' Menu_item S ' + ' management data ', ' cid ' = 2,], [' id ' = + 3, ' menu_collapse ' = ' + ' maintenance menu ', ' Menu_items ' + ' management user ', ' cid ' = 2,]]; $result =[]; $res =[];foreach ($arr as $k = > $v) {$result [$v [' CID ']][]= $v;} foreach ($result as $key = + $value) {if (count ($value) = = 1) {$res [$key]= $value [0]; } else{$res [$key] [' New ']= $value; }}echo ' 
 ';p Rint_r (array_values ($res));/*array ([0] = = Array (        [ID] + 1 [menu_collapse] + Super Menu [Menu_items] + write article [cid] = 1                        ) [1] = = Array ([new] = Array ([0] = = Array                            ([ID] + 2 [menu_collapse] = Maintenance Menu                    [Menu_items] + Management data [CID] = 2) [1] = = Array ([id] = 3 [Menu_co                        Llapse] = Maintenance Menu [Menu_items] + Admin user [CID] + 2 )                )        ))*/
                                        
                                    
You can only traverse the array to process it.
