simple OOP help

[lcaesars]

Hello everybdy,

 

Dealing with OOP last couple of days, I learned a lot. But I guess, I'm still missing the OOP concept and the logic behind it. Simply, I can't decide to use classes or not.

 

To make my understanding clear on OOP I would be greateful if you can help me on my example below.

 

For example, we need authentication for a website.

I defined AUTH_MODE variable in config file. It can have 3 values. "None","Simple" and "User". None is for websites we don't need private pages. Simple is for admin pages, where there is only one username and password stored in a config file. And User is for the systems there exist user registration with db interaction.

 

#1 Up to now, is everything ok? What I want to ask here is, do I need seperate class files for this three modes?

 

Let me continue with my example. I'm designing the User class now. It will have lots of methods like, login,confirm,lost_password,change_details..

And also there must be connection with my DB and Session Class..

 

#2 Should I put all the methods for User in the same class file or should I somehow split it into new files?

#3 And finally, whats the best way to include DB and Session classes? I mean is there any way other than instantiating my DB class in Auth class?

 

Thank you

[Daniel0]

1) You don't have to, but you could have an abstract class called Login and then have some sub-classes called Login_None, Login_Simple and Login_User.

2) I'd say one class per file.

3) You could use a registry, a singleton or you could pass the object as an argument to the method.

[aschk]

par example:

<?php
/**
* User class.
*
*/
class user {

private $username;
private $password;

public function __construct($username,$password){
	$this->username = $username;
	$this->password = $password;
}

public function getUsername(){
	return $this->username;
}

public function getPassword(){
	return $this->password;
}

}

/**
* Abstract login class.
*
*/
abstract class login {

abstract public function auth(user $user);

}

/**
* Does the lookup in the file.
*
*/
class login_simple extends login {

public function auth(user $user){
	// open file
	if($user->getUsername() == $file['username'] && $user->getPassword() == $file['password']){
		return true;
	}
	return false;
}

}

/**
* Does the lookup in the database.
*
*/
class login_user extends login {

public function auth(user $user){
	// connect to database
	$db->query("SELECT id FROM users WHERE username='{$user->getUsername()}' AND password = '{$user->getPassword()}'");
	if($db->numRows() === 1){
		return true;
	}
	return false;
}

}

/**
* Does NO lookup, always authenticates.
*
*/
class login_none extends login {

public function auth(user $user){
	// Always auths.
	return true;
}

}


// Test run.
$user = new user("joe","pass");
$login = new login_simple();

// Authenticated.
if($login->auth($user)){
// do something here;
}

?>