php 插入关联数组

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

// 插入一个新的键值对
$person["address"] = "123 Main St";

// 打印关联数组
print_r($person);
?>

<?php
$person = array(
    "name" => "John Doe",
    "age" => 30
);

// 检查键是否存在
if (!isset($person["name"])) {
    $person["name"] = "Jane Doe";
} else {
    // 处理键已存在的情况
    $person["name"] .= " (Updated)";
}

print_r($person);
?>

<?php
header('Content-Type: text/html; charset=utf-8');

$person = array(
    "姓名" => "张三",
    "年龄" => 25
);

print_r($person);
?>