PHP Classes Problem!

hello, i'm new to PHP but i've been exposed to many other programming languages like C++, Java and etc. I'm having a problem building a classes using PHP. I want to build a module (a group of classes) for authentication (username/password). the main problem here is, how can i build a module which can be used in any system without changing anything on the module itself? in other word is, i want to build a reusable login module that can be used for any system without making any changes on the module. can anyone answer the question or give some example on how to develop this system? thanks.

 

The process would have to be as follows:

- user requests login with username/password
- login is correct, but password is expired
- user sees message, that password has expired on change-password screen(!) and can enter his old and new password
- the user is forwarded to the requested page.

the question is how the module suppose to know where to redirect the page?

 

There are a number of ways you can deal with that issue.

You could, for example, pass the target page around as a parameter. Or, you could store it in a session variable, or in a cookie.

 

could u give some example or explain to me how to do it?

the major concern here is when the page redirect to change-password screen, how the module suppose to know which page to go without changing anything on the module...? because i want to make it re-usable over and over again to any system without to change anything inside the module...

 

well you have to give your module some kind of information, or you just use relative links and use the same page names on all your projects: login.php, register.php, login_failed.php etc...

 

can u explain in more details to me what did u mean by "give a module some kind of information"?

 

One way....

//If the user is not logged in...
if (!myLoginHandler->isUserLoggedIn()){
  //direct them to the login page, passing this page so that the
  //login script can send them back here when logged in
  myLoginHandler->doUserLogin("login.php",$_SERVER['PHP_SELF']);
}

Code (markup):

 

i alredy got the idea on how to solve the problem which is : to create an outside parameter - a define in the config or and argument of the calling handler function

// some included config.php

define("MEMBER_CHANGE_PWD"."http://...");
define("MEMBER_REDIRECT"."http://...");

define("LOGIN_OK","0");
define("LOGIN_FAILED","-1");
define("LOGIN_CHANGE","1"); 

Code (markup):

// A member class functions

function fnLogin(SOME PARAMS){
    $intLogin=$this->fnCheckLogin();

   if (LOGIN_CHANGE==$intLogin){
        header("Location:MEMBER_CHANGE_PWD");
         exit;
    } elseif (LOGIN_FAILED==$intLogin){
        header("Location:MEMBER_LOGIN_FAILED");        
        exit;
    } else (
// Login OK! do your work

     }

} 

Code (markup):

how can i put the session on this code so that from this module, the session will keep continue until the user logout or limit specific time if the user idle?

 

think i can:
your login page:

<?
$usr = new User();
//set parameters
$usr->page_login = "my_other_loginpage.php";
$usr->username = getpost("username");
$usr->password = getpost("password");
//call login with the given parameters
$usr->login();
?>

PHP:

your functions.php:

<?

class User() {
	var $id = "";
	var $username = "";
	var $password = "";

	//redirection targets
	var $page_login = "login.php";
	var $page_logout = "logout.php";
	var $page_wrong_password = "wrong_pass.php";
	var $page_unknown = "unknown.php";

	function login() {
		$sql = "select
				*
				from
				users
				where username like '".$this->username."' and password='".$this->password."'
				LIMIT 0, 1";
		//do the query, assume your results ends up in an array "user" after a query
		if(count($user)==1) {
			//store your user, redirect
			$_SESSION['user']=$user;
   			header("Location: ".$this->page_login);
   			exit;
		}
		else {
			//username/password missmatch or unknown user
   			header("Location: ".$this->page_wrong_password);
		}
	}	
}	

function getpost($varname, $default="") {
	//same with post
	if (!isset($_POST["$varname"])) $value = $default;
	else $value = $_POST["$varname"];
	$value=mysql_real_escape_string(trim($value));
	return $value;
}
?>

PHP:

hope you get the idea here and how to pass variables and values.
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