按两个字段分组php数组

<?php
// 假设有一个包含用户信息的数组
$users = [
    ["name" => "Alice", "age" => 25, "gender" => "female"],
    ["name" => "Bob", "age" => 30, "gender" => "male"],
    ["name" => "Charlie", "age" => 25, "gender" => "male"],
    ["name" => "David", "age" => 30, "gender" => "male"],
    ["name" => "Eve", "age" => 25, "gender" => "female"],
    ["name" => "Frank", "age" => 30, "gender" => "male"],
];

// 使用array_reduce()函数按两个字段分组
$groupedUsers = array_reduce($users, function($result, $user) {
    // 以年龄和性别作为键进行分组
    $key = $user['age'] . '-' . $user['gender'];
    
    // 将当前用户添加到相应分组中
    if (!isset($result[$key])) {
        $result[$key] = [];
    }
    $result[$key][] = $user;
    
    return $result;
}, []);

// 打印分组结果
foreach ($groupedUsers as $key => $group) {
    echo "Group: " . $key . "\n";
    foreach ($group as $user) {
        echo "Name: " . $user['name'] . "\n";
    }
    echo "\n";
}
?>

Group: 25-female
Name: Alice
Name: Eve

Group: 30-male
Name: Bob
Name: Charlie
Name: David
Name: Frank