After I stored the session in the database, a problem occurred when reading all session information?

This is the code

<code>function get() {
        session_start();
        $data = $this->db->fetchAll("SELECT * FROM session");
        foreach ($data as $key => &$value) {
            $need = stripcslashes($value['session_data']);
            session_decode($need);
            $value['session_data'] = $_SESSION;
        }
        var_dump($data);

    }

    private function copyArr($arr) {
        $copyArr = [];
        foreach ($arr as $key => $value) {
            $copyArr[$key] = $value;
        }
        return $copyArr;
    }
</code>

After I called the copyArr function: (The result is different)

Reply content:

This is the code

<code>function get() {
        session_start();
        $data = $this->db->fetchAll("SELECT * FROM session");
        foreach ($data as $key => &$value) {
            $need = stripcslashes($value['session_data']);
            session_decode($need);
            $value['session_data'] = $_SESSION;
        }
        var_dump($data);

    }

    private function copyArr($arr) {
        $copyArr = [];
        foreach ($arr as $key => $value) {
            $copyArr[$key] = $value;
        }
        return $copyArr;
    }
</code>

After I called the copyArr function: (The result is different)