class Database { private static $instance = null; private $connection = null; private function __construct() { $this->connection = new PDO("mysql:host=localhost;dbname=myDatabase", "username", "password"); } public static function getInstance() { if (self::$instance == null) { self::$instance = new Database(); } return self::$instance; } public function getConnection() { return $this->connection; } }
function getConfig($key) { static $config = array( "appName" => "My Application", "debug" => true, "maxUploadSize" => 1048576, // 1 MB ); return $config[$key]; }In this example, we define a `getConfig()` function that returns a static array of configuration variables. This function can be called anywhere in the script to retrieve the value of a specific configuration variable. This is a simple example of creating a package library for PHP static env. In conclusion, the PHP static env is a useful programming concept that allows for the definition of static resources that are meant to be accessed throughout the execution of a script. The examples shown here demonstrate how to define a singleton database connection object and global configuration variables. These examples can be extended to create a package library for common static resources in PHP.