What are the potential pitfalls of using global arrays like $_SESSION in PHP for storing objects?

Potential pitfalls of using global arrays like $_SESSION in PHP for storing objects include potential conflicts with other variables in the global scope, security vulnerabilities if not properly sanitized, and difficulties in managing and debugging the code due to the global nature of the variables. To solve this issue, it is recommended to encapsulate the object storage in a class and use getter and setter methods to interact with the stored objects.

class SessionManager {
    public function setObject($key, $object) {
        $_SESSION[$key] = serialize($object);
    }

    public function getObject($key) {
        return unserialize($_SESSION[$key]);
    }
}

// Example usage
$sessionManager = new SessionManager();
$object = new MyClass();
$sessionManager->setObject('myObject', $object);

// Retrieve the object
$retrievedObject = $sessionManager->getObject('myObject');