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https://www.allphptricks.com/simple-user-registration-login-script-in-php-and-mysqli/

1
CREATE DATABASE register;
CREATE TABLE IF NOT EXISTS `users` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(50) NOT NULL,
`email` varchar(50) NOT NULL,
`password` varchar(50) NOT NULL,
`trn_date` datetime NOT NULL,
PRIMARY KEY (`id`)
);


###################################
Create registration.php
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Registration</title>
<link rel="stylesheet" href="css/style.css" />
</head>
<body>
<?php
require('db.php');
// If form submitted, insert values into the database.
if (isset($_REQUEST['username'])){
        // removes backslashes
$username = stripslashes($_REQUEST['username']);
        //escapes special characters in a string
$username = mysqli_real_escape_string($con,$username);
$email = stripslashes($_REQUEST['email']);
$email = mysqli_real_escape_string($con,$email);
$password = stripslashes($_REQUEST['password']);
$password = mysqli_real_escape_string($con,$password);
$trn_date = date("Y-m-d H:i:s");
        $query = "INSERT into `users` (username, password, email, trn_date)
VALUES ('$username', '".md5($password)."', '$email', '$trn_date')";
        $result = mysqli_query($con,$query);
        if($result){
            echo "<div class='form'>
<h3>You are registered successfully.</h3>
<br/>Click here to <a href='login.php'>Login</a></div>";
        }
    }else{
?>
<div class="form">
<h1>Registration</h1>
<form name="registration" action="" method="post">
<input type="text" name="username" placeholder="Username" required />
<input type="email" name="email" placeholder="Email" required />
<input type="password" name="password" placeholder="Password" required />
<input type="submit" name="submit" value="Register" />
</form>
</div>
<?php } ?>
</body>
</html>
################################
create login.php
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Login</title>
<link rel="stylesheet" href="css/style.css" />
</head>
<body>
<?php
require('db.php');
session_start();
// If form submitted, insert values into the database.
if (isset($_POST['username'])){
        // removes backslashes
$username = stripslashes($_REQUEST['username']);
        //escapes special characters in a string
$username = mysqli_real_escape_string($con,$username);
$password = stripslashes($_REQUEST['password']);
$password = mysqli_real_escape_string($con,$password);
//Checking is user existing in the database or not
        $query = "SELECT * FROM `users` WHERE username='$username'
and password='".md5($password)."'";
$result = mysqli_query($con,$query) or die(mysql_error());
$rows = mysqli_num_rows($result);
        if($rows==1){
    $_SESSION['username'] = $username;
            // Redirect user to index.php
    header("Location: index.php");
         }else{
echo "<div class='form'>
<h3>Username/password is incorrect.</h3>
<br/>Click here to <a href='login.php'>Login</a></div>";
}
    }else{
?>
<div class="form">
<h1>Log In</h1>
<form action="" method="post" name="login">
<input type="text" name="username" placeholder="Username" required />
<input type="password" name="password" placeholder="Password" required />
<input name="submit" type="submit" value="Login" />
</form>
<p>Not registered yet? <a href='registration.php'>Register Here</a></p>
</div>
<?php } ?>
</body>
</html>
######################################

create db.php

<?php
// Enter your Host, username, password, database below.
// I left password empty because i do not set password on localhost.
$con = mysqli_connect("localhost","root","","register");
// Check connection
if (mysqli_connect_errno())
  {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
  }
?>
####################################

create auth.php

<?php
session_start();
if(!isset($_SESSION["username"])){
header("Location: login.php");
exit(); }
?>
#######################################

create index.php page

<?php
//include auth.php file on all secure pages
include("auth.php");
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Welcome Home</title>
<link rel="stylesheet" href="css/style.css" />
</head>
<body>
<div class="form">
<p>Welcome <?php echo $_SESSION['username']; ?>!</p>
<p>This is secure area.</p>
<p><a href="dashboard.php">Dashboard</a></p>
<a href="logout.php">Logout</a>
</div>
</body>
</html>
######################################

create dashboard.php page

<?php
require('db.php');
include("auth.php");
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Dashboard - Secured Page</title>
<link rel="stylesheet" href="css/style.css" />
</head>
<body>
<div class="form">
<p>Dashboard</p>
<p>This is another secured page.</p>
<p><a href="index.php">Home</a></p>
<a href="logout.php">Logout</a>
</div>
</body>
</html>
####################################

create logout.php

<?php
session_start();
// Destroying All Sessions
if(session_destroy())
{
// Redirecting To Home Page
header("Location: login.php");
}
?>
#######################################################

create style.css

body {
     font-family:Arial, Sans-Serif;
}
.clearfix:before, .clearfix:after{
     content: "";
     display: table;
}
.clearfix:after{
     clear: both;
}
a{
     color:#0067ab;
     text-decoration:none;
}
a:hover{
     text-decoration:underline;
}
.form{
     width: 300px;
     margin: 0 auto;
}
input[type='text'], input[type='email'],
input[type='password'] {
     width: 200px;
     border-radius: 2px;
     border: 1px solid #CCC;
     padding: 10px;
     color: #333;
     font-size: 14px;
     margin-top: 10px;
}
input[type='submit']{
     padding: 10px 25px 8px;
     color: #fff;
     background-color: #0067ab;
     text-shadow: rgba(0,0,0,0.24) 0 1px 0;
     font-size: 16px;
     box-shadow: rgba(255,255,255,0.24) 0 2px 0 0 inset,#fff 0 1px 0 0;
     border: 1px solid #0164a5;
     border-radius: 2px;
     margin-top: 10px;
     cursor:pointer;
}
input[type='submit']:hover {
     background-color: #024978;
}
##################################################
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