二维数组合并成三维数组

Question

[["id"=>1,"name"=>"mi5","pp"=>"xiaomi"],
 ["id"=>2,"name"=>"ip5","pp"=>"apple"],
 ["id"=>3,"name"=>"ip6","pp"=>"xiaomi"],
 ["id"=>4,"name"=>"ip6","pp"=>"apple"]
];

以二维数组中的name 和 pp 相同的值分组

结果是：

[["id"=>1,"name"=>"mi5","pp"=>"xiaomi"],
 ["id"=>2,"name"=>"ip5","pp"=>"apple"],
 [["id"=>3,"name"=>"ip6","pp"=>"apple"],
 ["id"=>4,"name"=>"ip6","pp"=>"apple"]]
];

相同name和pp被分到三维数组中，这是一个例子，实际分类的条件有四个，而且每个的值都很长。求解，目前只能想到两层遍历。

Answer 1

<?php
$array = [
     ["id"=>1,"name"=>"mi5","pp"=>"xiaomi"],
     ["id"=>2,"name"=>"ip5","pp"=>"apple"],

     ["id"=>3,"name"=>"ip6","pp"=>"apple"],
     ["id"=>3,"name"=>"ip6","pp"=>"ip"],
     ["id"=>4,"name"=>"ip6","pp"=>"apple"]
    ];
/*
[
 ["id"=>1,"name"=>"mi5","pp"=>"xiaomi"],
 ["id"=>2,"name"=>"ip5","pp"=>"apple"],
 [
     ["id"=>3,"name"=>"ip6","pp"=>"apple"],
     ["id"=>4,"name"=>"ip6","pp"=>"apple"]
 ]
];
*/

$container = [];
array_map(function( $val ) use ( &$container ) {
    $container[ $val['name'].$val['pp'] ][] = $val; 
}, $array);

var_dump(array_values($container));