封装嵌入式变量数组php

<?php
// 定义一个关联数组，包含用户信息
$user = [
    'name' => 'John Doe',
    'email' => 'john.doe@example.com',
    'age' => 30
];

// 定义一个函数，接收一个关联数组作为参数
function printUserInfo($user) {
    echo "Name: " . $user['name'] . "\n";
    echo "Email: " . $user['email'] . "\n";
    echo "Age: " . $user['age'] . "\n";
}

// 调用函数并传递关联数组
printUserInfo($user);
?>

<?php
$user = [
    'name' => 'John Doe',
    'email' => 'john.doe@example.com',
    'age' => 30
];

// 错误的键名
echo $user['nam']; // 这将导致 Notice: Undefined index: nam
?>

<?php
// 未初始化的数组
echo $user['name']; // 这将导致 Notice: Undefined variable: user

// 正确的做法
$user = [];
$user['name'] = 'John Doe';
echo $user['name']; // 输出: John Doe
?>