php 常量数组

define('CONFIG', [
    'db_host' => 'localhost',
    'db_user' => 'root',
    'db_pass' => 'password',
    'db_name' => 'mydatabase'
]);

echo CONFIG['db_host']; // 输出: localhost

const STATUS = [
    'active' => 1,
    'inactive' => 2,
    'pending' => 3
];

echo STATUS['active']; // 输出: 1

$config = [
    'db_host' => 'localhost',
    'db_user' => 'root',
    'db_pass' => 'password',
    'db_name' => 'mydatabase'
];

$config['db_host'] = '127.0.0.1'; // 可以修改

class MyClass {
    const CONFIG = [
        'db_host' => 'localhost',
        'db_user' => 'root',
        'db_pass' => 'password',
        'db_name' => 'mydatabase'
    ];

    public function getDbHost() {
        return self::CONFIG['db_host']; // 或者 return static::CONFIG['db_host'];
    }
}

$obj = new MyClass();
echo $obj->getDbHost(); // 输出: localhost