按关联数组上的重复值对关联数组进行排序

Question

我想按特定键的重复值对数组进行排序：我不想删除重复项，但我只需要按重复项对数组进行排序

例如我有这个数组：

$data = array(
    array(
        "id" => 1,
        "name" => "Bruce Wayne",
        "city" => "Gotham",
        "gender" => "Male"
    ),
    array(
        "id" => 2,
        "name" => "Diana Prince",
        "city" => "Gotham",
        "gender" => "Male"
    ),
    array(
        "id" => 4,
        "name" => "Speedy Gonzales",
        "city" => "New Mexico",
        "gender" => "Male"
    ),    
    array(
        "id" => 3,
        "name" => "Diana Prince",
        "city" => "New Mexico",
        "gender" => "Female"
    ),

    array(
        "id" => 5,
        "name" => "Bruce Wayne",
        "city" => "Gotham",
        "gender" => "Male"
    ),
);

我的回答是：

$data = array(
        "id" => 1,
        "name" => "Bruce Wayne",
        "city" => "Gotham",
        "gender" => "Male"
    ),
    array(
        "id" => 5,
        "name" => "Bruce Wayne",
        "city" => "Gotham",
        "gender" => "Male"
    ),
    array(
        "id" => 2,
        "name" => "Diana Prince",
        "city" => "Gotham",
        "gender" => "Male"
    ),
   array(
        "id" => 3,
        "name" => "Diana Prince",
        "city" => "New Mexico",
        "gender" => "Female"
    ),
    array(
        "id" => 4,
        "name" => "Speedy Gonzales",
        "city" => "New Mexico",
        "gender" => "Male"
    )
);

在我的代码中，我有一个关联数组，我需要按给定的键对它进行排序，而不删除我需要的所有重复值我怎样才能做到这一点？谢谢

Answer 1

通过array_mutlisort()结合array_column()使用多维排序（取哪一列作为排序的依据）。这个函数是通过引用的，所以你不需要将结果赋值回某个东西。

$data = array(...);
array_multisort(array_column($data, "name"), SORT_ASC, $data);
print_r($data);

https://3v4l.org/1n8fW

Answer 2

您可以使用usort

function compare($a, $b)
{
   if ($a["name"] == $b["name"]) {
    return 0;
   }
  return ($a["name"] < $b["name"]) ? -1 : 1;
}

usort($data,"compare");

按关联数组上的重复值对关联数组进行排序

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