How can the use of global constants like define() impact PHP code and what are the alternatives?

Using global constants like define() can make your PHP code more organized and easier to maintain, as it allows you to define a value once and use it throughout your code without the risk of accidentally changing it. However, overusing global constants can lead to a cluttered global namespace and potential naming conflicts. One alternative to using global constants is to use class constants, which are scoped to the class they are defined in and can provide similar benefits without polluting the global namespace. Another alternative is to use configuration files or dependency injection to manage and access constants in a more controlled manner. 

// Using class constants
class Config {
    const SITE_NAME = "My Website";
    const DB_HOST = "localhost";
    const DB_USER = "root";
    const DB_PASS = "password";
}

echo Config::SITE_NAME;

// Using configuration file
$config = include 'config.php';
echo $config['site_name'];

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global constants define() impact PHP code alternatives

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