What potential issue could arise when storing session values in a PHP class and accessing them in another class?

When storing session values in a PHP class and accessing them in another class, the potential issue that could arise is that the session may not be started or initialized in the second class, leading to undefined session variables. To solve this issue, you can start the session in the second class before accessing the session values. 

<?php

class SessionManager {
    public function __construct() {
        session_start();
    }

    public function setSessionValue($key, $value) {
        $_SESSION[$key] = $value;
    }

    public function getSessionValue($key) {
        return $_SESSION[$key] ?? null;
    }
}

class SecondClass {
    public function __construct() {
        session_start();
    }

    public function getSessionValueFromManager($key, $sessionManager) {
        return $sessionManager->getSessionValue($key);
    }
}

$sessionManager = new SessionManager();
$sessionManager->setSessionValue('user_id', 123);

$secondClass = new SecondClass();
echo $secondClass->getSessionValueFromManager('user_id', $sessionManager);

?>

Keywords

session values PHP class accessing potential issue another class

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