How to Create Login Page in PHP/MySQL

Submitted by argie on Friday, May 25, 2012 - 10:49.

Related code: How to Create Secure Login Page in PHP/MySQL. Yesterday I posted a tutorial on how to create a registration page using PHP/MySQL. To make some follow up with my registration page tutorial, I decided to create another tutorial on how to create a login page using PHP/MySQL. The Features of my login page contain input validation using PHP session. One unique feature also with my login page is the logout function, it is unique because unlike with other login page once the user click the logout button and click the back button of the browser, their system allows the user to go back as if it still logged in, which is not appropriate for security reason. But here in my login page once the user click the logout button, the user can no longer go back to their previous page. The only way to go back to the previous page is to login again. To start this tutorial let’s follow some steps below.

Creating Our Database

First we are going to create our database which stores our data. To create a database: 1. Open phpmyadmin 2. Click create table and name it. 3. Then name the database as "simple_login". 4. After creating a database name, click the SQL and paste the following code.

CREATE TABLE IF NOT EXISTS `member` (
  `mem_id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(30) NOT NULL,
  `password` varchar(30) NOT NULL,
  `fname` varchar(30) NOT NULL,
  `lname` varchar(30) NOT NULL,
  `address` varchar(100) NOT NULL,
  `contact` varchar(30) NOT NULL,
  `picture` varchar(100) NOT NULL,
  `gender` varchar(10) NOT NULL,
  PRIMARY KEY (`mem_id`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ;

Creating Our Form

Next step is to create a form and save it as index.php. To create a form, open your HTML code editor and paste the code below in the upper part of the document or above the html tag. The code below is use to disallow the user to go back as if it still logged in.

<?php
        //Start session
        session_start();        
        //Unset the variables stored in session
        unset($_SESSION['SESS_MEMBER_ID']);
        unset($_SESSION['SESS_FIRST_NAME']);
        unset($_SESSION['SESS_LAST_NAME']);
?>

Paste the code bellow after the body tag of the HTML document

<form name="loginform" action="login_exec.php" method="post">
<table width="309" border="0" align="center" cellpadding="2" cellspacing="5">
  <tr>
    <td colspan="2">
                <!--the code bellow is used to display the message of the input validation-->
                 <?php
                        if( isset($_SESSION['ERRMSG_ARR']) && is_array($_SESSION['ERRMSG_ARR']) && count($_SESSION['ERRMSG_ARR']) >0 ) {
                        echo '<ul class="err">';
                        foreach($_SESSION['ERRMSG_ARR'] as $msg) {
                                echo '<li>',$msg,'</li>'; 
                                }
                        echo '</ul>';
                        unset($_SESSION['ERRMSG_ARR']);
                        }
                ?>
        </td>
  </tr>
  <tr>
    <td width="116"><div align="right">Username</div></td>
    <td width="177"><input name="username" type="text" /></td>
  </tr>
  <tr>
    <td><div align="right">Password</div></td>
    <td><input name="password" type="text" /></td>
  </tr>
  <tr>
    <td><div align="right"></div></td>
    <td><input name="" type="submit" value="login" /></td>
  </tr>
</table>
</form>

Creating our Connection

Next step is to create a database connection and save it as "connection.php". This file is used to connect our form to database.

<?php
$mysql_hostname = "localhost";
$mysql_user = "root";
$mysql_password = "";
$mysql_database = "simple_login";
$prefix = "";
$bd = mysqli_connect($mysql_hostname, $mysql_user, $mysql_password) or die("Could not connect database");
mysqli_select_db($bd, $mysql_database) or die("Could not select database");
?>

Writing Our Login Script

Next step is to create our login script that validates our input data and save it as login_exec.php.

<?php
        //Start session
        session_start();
 
        //Include database connection details
        require_once('connection.php');
 
        //Array to store validation errors
        $errmsg_arr = array();
 
        //Validation error flag
        $errflag = false;
 
        //Function to sanitize values received from the form. Prevents SQL injection
        function clean($str) {
                echo "str: ".$str;
                $str = @trim($str);
                if(get_magic_quotes_gpc()) {
                        $str = stripslashes($str);
                }
                return mysqli_real_escape_string($str);
        }
 
        //Sanitize the POST values
        $username = $_POST['username'];
        $password = $_POST['password'];
 
        //Input Validations
        if($username == '') {
                $errmsg_arr[] = 'Username missing';
                $errflag = true;
        }
        if($password == '') {
                $errmsg_arr[] = 'Password missing';
                $errflag = true;
        }
 
        //If there are input validations, redirect back to the login form
        if($errflag) {
                $_SESSION['ERRMSG_ARR'] = $errmsg_arr;
                session_write_close();
                header("location: index.php");
                exit();
        }
 
        //Create query
        $qry="SELECT * FROM member WHERE username='$username' AND password='$password'";
        $result=mysqli_query($bd, $qry);
 
        //Check whether the query was successful or not
        if($result) {
                if(mysqli_num_rows($result) > 0) {
                        //Login Successful
                        session_regenerate_id();
                        $member = mysqli_fetch_assoc($result);
                        $_SESSION['SESS_MEMBER_ID'] = $member['mem_id'];
                        $_SESSION['SESS_FIRST_NAME'] = $member['username'];
                        $_SESSION['SESS_LAST_NAME'] = $member['password'];
                        session_write_close();
                        header("location: home.php");
                        exit();
                }else {
                        //Login failed
                        $errmsg_arr[] = 'user name and password not found';
                        $errflag = true;
                        if($errflag) {
                                $_SESSION['ERRMSG_ARR'] = $errmsg_arr;
                                session_write_close();
                                header("location: index.php");
                                exit();
                        }
                }
        }else {
                die("Query failed");
        }
?>

Creating Our Authentication File

Next step is to create our authentication file and save it as auth.php. this code is use to disallow the user to go back as if it still logged in.

<?php
        //Start session
        session_start();
        //Check whether the session variable SESS_MEMBER_ID is present or not
        if(!isset($_SESSION['SESS_MEMBER_ID']) || (trim($_SESSION['SESS_MEMBER_ID']) == '')) {
                header("location: index.php");
                exit();
        }
?>

Creating Our Home page

Next step is to create a homepage and save it as home.php.

<?php
        require_once('auth.php');
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
<style type="text/css">
<!--
.style1 {
        font-size: 36px;
        font-weight: bold;
}
-->
</style>
</head>
 
<body>
<p align="center" class="style1">Login successfully </p>
<p align="center">This page is the home, you can put some stuff here......</p>
<p align="center"><a href="index.php">logout</a></p>
</body>
</html>

That’s all you have already created your login page with unique features. Hope this code will help you, see you guys in my next tutorial. We've created a more secure registration and login page using CodeIgniter and Ion Auth. We highly recommend you use this instead if you want to secure your site. However, we're using CodeIgniter framework on this. If you are interested, kindly visit Secure Registration and Login Script with PHP and MySQL using CodeIgniter and Ion Auth.

Comments

Type

Just use "<input name="password" type="password">"

iframe

You can use an iframe.

nice ,,,,,,,,,,,,,,,, goo job

username and password

sir, can u give me the username and password.. my email id is [email protected]

please reply

i got an error message. please help me to clarify Warning: Cannot modify header information - headers already sent by (output started at C:\AppServ\www\an\connection.php:19) in C:\AppServ\www\an\login_exec.php on line 68

database

It give error that database could not be selected... please tell which database is selected

logout

ur codeis superb help in log out code

Limiting Guest user to see all records in the table.

How can i stop guest user to view List-page ( all records )in my database tables. Guest user should see only record by search criteria. Guest user should not see the list of all records in some table.

I have a problem

i want to update my data..after updating when i click button automatically it moves to logout page..i dont know what to do..i checked everything..in localhost it works perfectly but after upload into server it create problem

I'm so lazy

Attach the source code in zip and upload it for us to download please

Thank you !....

Is a simple and clean code.Easy to follow and understand.

GOD Bless U

this code is ver useful

Error in Code Line 56,57

I think it should be like

$_SESSION['SESS_FIRST_NAME'] = $member['fname'];
$_SESSION['SESS_LAST_NAME'] = $member['lname'];

it is too easy and awesome ..

it is too easy and awesome ....

Want to update my mysql table from home page

How i will update my sql table from home.php please help me with code

Truce

Nice codes. It worked for me :)

Output getting 'query failed'

I am getting output query failed .plz tell me where i am wrong

nice code

thanks for this code ....it fully running

awesome

this really helped me, thanks.

thanks it help me a lot

Thanks

Hello Thank You So Much For Detailed Explanation

its saying ....Query Failed .

its saying ....Query Failed ....wats up

Awesome .....

Cant say awesome to learn

Thank you !!

Hi! I installed and everything is working smoothly. Thank you very much for sharing such a great tool and explanation. Regards, Fernando

It is very impotant thankes

It is very impotant thankes to much

Am starting to work on it....

Am starting to work on it.....i know twill work

Thanks

Thanks Man! Be blessed

tnx

hi dear i just wanna to say thank you ..i was desperately wanted this information god bless you bye amirhossein

please

can you please help in next previous, last and first buttons in php/mysql

Nice tutorial ... but missing

Nice tutorial ... but missing a register page can someone help me to make it. or someone is make reg page for this tutorial :D Thanks for sharing.

Code in error

$_SESSION['SESS_MEMBER_ID'] = $member['mem_id']; 56. $_SESSION['SESS_FIRST_NAME'] = $member['username']; 57. $_SESSION['SESS_LAST_NAME'] = $member['password']; 58. session_write_close(); Names don't match!!

thanks you for your explore

I will try this soon. Please,

I will try this soon. Please, I will need similar in PHP on online students examinations in five subjects(computer science, chemistry, biology and physics) with instant result at the end of exams.

need a feedback form

i want a feed back form and its comments and the name of the person who comments are shows in bellow the space

php

true but this code is too lenthy and difficult

perfect tutorial

this is by far the best sample login Ive used, thanks for sharing

unable to create connection mysql login page

please i need support thank you

help me

hi
i am riham
how to hide password in password text box????
pls help me

How this coding file will run ?

Argie I have a different issue...I made login,index,home,connection,auth.php and transfer it to server folder, this folder contain website files, also In server I created database paste the sql code.......but how it will run? your help/answer will be highly appreciated, because i am a beginner, plz urgently, [email protected]

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