其实要实现很简单直接foreach,再根据PHP中数组的特性就可以轻松实现。

2|0步骤

$info = [

[

"gname" => "特别关心" ,

"gid" => 1, "fid" => 2,

"nickname" => "立冬" ,

"avatar" => "http://cache.wangyangyang.vip/avatar_4.gif",

"remark" => "" ,

"desc" => "雪花一片一片的洒落在窗台上，田野间，为大地换上了新装~"

],

[

"gname" => "我的好友",

"gid" => 2,

"fid" => 3,

"nickname" => "立春",

"avatar" => "http://cache.wangyangyang.vip/avatar_3.jpg",

"remark" => "",

"desc" => "我在春天等着你的到来~"

],

[

"gname" => "朋友" ,

"gid" => 3,

"fid" => 4,

"nickname" => "立夏" ,

"avatar" => "http://cache.wangyangyang.vip/12222222222222.jpg" ,

"remark" => "" ,

"desc" => "你好啊，夏天！"

],

[

"gname" => "同学" ,

"gid" => 4,

"fid" => 5,

"nickname" => "小雨" ,

"avatar" => "http://cache.wangyangyang.vip/avatar_5.jpg" ,

"remark" => "" ,

"desc" => "人间四月芳菲尽，山寺桃花始盛开！"

],

[

"gname" =>"同学" ,

"gid" => 4,

"fid" => 6,

"nickname" => "残雪殇" ,

"avatar" => "http://cache.wangyangyang.vip/12222222222222.jpg" ,

"remark" => "小雪" ,

"desc" => "断桥残雪，三潭映月，君可知为何如此？"

]

]

合并后的数据

将数组中某一个相同的值作为键，然后生成一个新的三维数组

$list = [];

foreach ($info as $k => $v) {

$list[$v[‘gid‘]][‘gid‘] = $v[‘gid‘];

$list[$v[‘gid‘]][‘gname‘] = $v[‘gname‘];

$list[$v[‘gid‘]][‘list‘][] = $v;

}

得到数据

$list=[

1=>[

"gid"=>1,

"gname"=> "特别关心",

"list"=>[

[

"gname"=>"特别关心",

"gid"=>1,

"fid"=>2,

"nickname"=>"立冬",

"avatar"=>"http://cache.wangyangyang.vip/avatar_4.gif",

"remark"=>"",

"desc"=>"雪花一片一片的洒落在窗台上，田野间，为大地换上了新装~"

]

]

],

2=> [

"gid"=>2,

"gname"=> "我的好友",

"list"=>[

[

"gname"=>"我的好友",

"gid"=>2,

"fid"=>3,

"nickname"=> "立春",

"avatar"=>"http://cache.wangyangyang.vip/avatar_3.jpg",

"remark"=>"",

"desc"=> "我在春天等着你的到来~"

]

]

],

3=>[

"gid"=>3,

"gname"=>"朋友",

"list"=>[

[

"gname"=>"朋友",

"gid"=>3,

"fid"=>4,

"nickname"=> "立夏",

"avatar"=> "http://cache.wangyangyang.vip/12222222222222.jpg",

"remark"=> "",

"desc"=>"你好啊，夏天！"

]

]

],

4=>[

"gid"=>4,

"gname"=>"同学",

"list"=>[

[

"gname"=>"同学",

"gid"=>4,

"fid"=>5,

"nickname"=>"小雨",

"avatar"=>"http://cache.wangyangyang.vip/avatar_5.jpg",

"remark"=> "",

"desc"=>"人间四月芳菲尽，山寺桃花始盛开！"

],

[

"gname"=> "同学",

"gid"=>4,

"fid"=>6,

"nickname"=>"残雪殇",

"avatar"=>"http://cache.wangyangyang.vip/12222222222222.jpg",

"remark"=> "小雪",

"desc"=>"断桥残雪，三潭映月，君可知为何如此？"

]

]

]

]

原文：https://www.cnblogs.com/yehuisir/p/12938897.html