php 添加关联数组

<?php
// 创建一个关联数组
$user = array(
    "name" => "John Doe",
    "age" => 30,
    "email" => "john.doe@example.com"
);

// 访问关联数组中的元素
echo $user["name"]; // 输出: John Doe
echo $user["age"];  // 输出: 30
echo $user["email"]; // 输出: john.doe@example.com

// 修改关联数组中的元素
$user["age"] = 31;
echo $user["age"]; // 输出: 31

// 添加新的键值对
$user["phone"] = "123-456-7890";
echo $user["phone"]; // 输出: 123-456-7890

// 删除键值对
unset($user["email"]);
echo $user["email"]; // 输出: (空)
?>

foreach ($user as $key => $value) {
    echo "$key: $value\n";
}

name: John Doe
age: 31
phone: 123-456-7890