我们可以在php类中定义很多方法吗？

有些人问这个问题,但我想讨论一下课堂的功能性.
如果我们定义了很多方法,那么在类中可以实现1000,3000或更多代码行.
它会影响课堂表现吗？我的意思是,如果我们实例化一个类的对象,所有方法都转到内存中？它的花费是内存使用量？或者它根本不重要.

像这样：

class User extends databaSEObject{

    protected static $table_name="users";
    protected static $db_fields=array('id','user_type_id','firstname','lastname','password','email','mobile','ostan_id','city_id','tahsilat_id','education_cluster_id','code_meli','birth_date','mobile_verify_code','mail_verify_code','is_instituter','gender_id','active_by','actived_date');

    protected static $required=array('firstname','mobile');
    protected static $missing=array();

    public $id;
    public $user_type_id;
    public $firstname="";
    public $lastname="";
    public $password;
    public $email;
    public $mobile;
    public $ostan_id;
    public $city_id;
    public $tahsilat_id;
    public $education_cluster_id;
    public $code_meli;
    public $birth_date;
    public $mobile_verify_code;
    public $mail_verify_code;
    public $is_verified;
    public $is_instituter=0;
    public $active_by;
    public $actived_date;