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‎README.md

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# authentication-system-mysql-php-LOGIN-SYSTEM-IN-PHP-AND-MYSQL
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user login system using php and mysql
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# LOGIN SYSTEM IN PHP AND MYSQL: User Authentication system.
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###### VERSION 1.0.0
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User authentication in web developemen is used to authorized and
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restrict users to certain pages in a web appplication.
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## REGISTERATION SYSTEM
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### DATABASE TABLE IN MYSQL
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The database used is MySQL, so you'll need a MySQL database to run create the users table.
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Run the `sql.sql` file in MySQL database to create users table
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### CONFIGURATION FILE
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The PHP script to connect to the database is in `config/config.php` directory.
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Replace credentials to in `config.php` to match your server credentials.
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### REGISTERATION FORM AND SCRIPT
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The `register.php` creates a web form that allows users to register themselves.
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The script generates error if form input is empty and username is has been taking already by another user.
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## LOGIN SYSTEM
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### LOGIN FORM AND SCRIPT
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`login.php` is the login script.
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When a user submit a form with the input of username and password, these inputs will be verified against the credentials data stored in the database, if there is a match then the user will be authorized and granted access to site or page.
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### WELCOME PAGE
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User is redirected to `welcome.php` if login is successful.
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### PASSWORD RESET
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logged in user can reset password for registered account.
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script is in `password_reset.php`
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<hr />
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<small>Give this a project ⭐ if you found it useful, and follow me for more interesting future projects</small>

‎login.php

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<?php
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// Initialize sessions
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session_start();
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// Check if the user is already logged in, if yes then redirect him to welcome page
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if (isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true) {
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header("location: welcome.php");
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exit;
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}
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// Include config file
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require_once "config/config.php";
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// Define variables and initialize with empty values
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$username = $password = '';
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$username_err = $password_err = '';
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// Process submitted form data
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if ($_SERVER['REQUEST_METHOD'] === 'POST') {
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// Check if username is empty
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if (empty(trim($_POST['username']))) {
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$username_err = 'Please enter username.';
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} else {
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$username = trim($_POST['username']);
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}
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// Check if password is empty
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if (empty(trim($_POST['password']))) {
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$password_err = 'Please enter your password.';
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} else {
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$password = trim($_POST['password']);
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}
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// Validate credentials
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if (empty($username_err) && empty($password_err)) {
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// Prepare a select statement
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$sql = 'SELECT id, username, password FROM users WHERE username = ?';
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if ($stmt = $mysql_db->prepare($sql)) {
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// Set parmater
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$param_username = $username;
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// Bind param to statement
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$stmt->bind_param('s', $param_username);
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// Attempt to execute
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if ($stmt->execute()) {
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// Store result
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$stmt->store_result();
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// Check if username exists. Verify user exists then verify
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if ($stmt->num_rows == 1) {
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// Bind result into variables
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$stmt->bind_result($id, $username, $hashed_password);
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if ($stmt->fetch()) {
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if (password_verify($password, $hashed_password)) {
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// Start a new session
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session_start();
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// Store data in sessions
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$_SESSION['loggedin'] = true;
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$_SESSION['id'] = $id;
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$_SESSION['username'] = $username;
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// Redirect to user to page
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header('location: welcome.php');
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} else {
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// Display an error for passord mismatch
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$password_err = 'Invalid password';
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}
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}
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} else {
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$username_err = "Username does not exists.";
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}
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} else {
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echo "Oops! Something went wrong please try again";
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}
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// Close statement
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$stmt->close();
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}
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// Close connection
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$mysql_db->close();
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}
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}
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?>
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Sign in</title>
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<link href="https://stackpath.bootstrapcdn.com/bootswatch/4.4.1/cosmo/bootstrap.min.css" rel="stylesheet" integrity="sha384-qdQEsAI45WFCO5QwXBelBe1rR9Nwiss4rGEqiszC+9olH1ScrLrMQr1KmDR964uZ" crossorigin="anonymous">
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<style>
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.wrapper {
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width: 500px;
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padding: 20px;
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}
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.wrapper h2 {
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text-align: center
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}
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.wrapper form .form-group span {
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color: red;
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}
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</style>
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</head>
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<body>
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<main>
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<section class="container wrapper">
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<h2 class="display-4 pt-3">Login</h2>
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<p class="text-center">Please fill this form to create an account.</p>
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<form action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']); ?>" method="POST">
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<div class="form-group <?php (!empty($username_err)) ? 'has_error' : ''; ?>">
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<label for="username">Username</label>
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<input type="text" name="username" id="username" class="form-control" value="<?php echo $username ?>">
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<span class="help-block"><?php echo $username_err; ?></span>
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</div>
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<div class="form-group <?php (!empty($password_err)) ? 'has_error' : ''; ?>">
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<label for="password">Password</label>
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<input type="password" name="password" id="password" class="form-control" value="<?php echo $password ?>">
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<span class="help-block"><?php echo $password_err; ?></span>
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</div>
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<div class="form-group">
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<input type="submit" class="btn btn-block btn-outline-primary" value="login">
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</div>
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<p>Don't have an account? <a href="register.php">Sign in</a>.</p>
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</form>
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</section>
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</main>
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</body>
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</html>

‎logout.php

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<?php
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// Start sessions
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session_start();
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$_SESSION = array();
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// Destroy all session related to user
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session_destroy();
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// Redirect to login page
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header('location: login.php');
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exit;

‎password_reset.php

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<?php
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// Initialize the session
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session_start();
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// Check if the user is logged in, if not then redirect to login page
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if (!isset($_SESSION['loggedin']) || $_SESSION['loggedin'] !== true) {
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header('location: login.php');
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exit;
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}
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// Include config file
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require_once 'config/config.php';
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// Define variables and initialize with empty values
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$new_password = $confirm_password = '';
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$new_password_err = $confirm_password_err = '';
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// Processing form data when form is submitted
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if ($_SERVER['REQUEST_METHOD'] == 'POST') {
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// Validate new password
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if (empty(trim($_POST['new_password']))) {
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$new_password_err = 'Please enter the new password.';
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} elseif (strlen(trim($_POST['new_password'])) < 6) {
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$new_password_err = 'Password must have atleast 6 characters.';
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} else {
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$new_password = trim($_POST['new_password']);
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}
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// Validate confirm password
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if (empty(trim($_POST['confirm_password']))) {
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$confirm_password_err = 'Please confirm the password.';
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} else {
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$confirm_password = trim($_POST['confirm_password']);
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if (empty($new_password_err) && ($new_password != $confirm_password)) {
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$confirm_password_err = 'Password did not match.';
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}
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}
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// Check input errors before updating the database
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if (empty($new_password_err) && empty($confirm_password_err)) {
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// Prepare an update statement
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$sql = 'UPDATE users SET password = ? WHERE id = ?';
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if ($stmt = $mysql_db->prepare($sql)) {
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// Set parameters
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$param_password = password_hash($new_password, PASSWORD_DEFAULT);
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$param_id = $_SESSION["id"];
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// Bind variables to the prepared statement as parameters
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$stmt->bind_param("si", $param_password, $param_id);
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// Attempt to execute the prepared statement
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if ($stmt->execute()) {
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// Password updated successfully. Destroy the session, and redirect to login page
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session_destroy();
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header("location: login.php");
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exit();
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} else {
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echo "Oops! Something went wrong. Please try again later.";
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}
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// Close statement
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$stmt->close();
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}
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// Close connection
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$mysql_db->close();
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}
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}
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?>
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Reset Password</title>
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<link href="https://stackpath.bootstrapcdn.com/bootswatch/4.4.1/cosmo/bootstrap.min.css" rel="stylesheet" integrity="sha384-qdQEsAI45WFCO5QwXBelBe1rR9Nwiss4rGEqiszC+9olH1ScrLrMQr1KmDR964uZ" crossorigin="anonymous">
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<style type="text/css">
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.wrapper {
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width: 500px;
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padding: 20px;
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}
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.wrapper h2 {
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text-align: center
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}
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.wrapper form .form-group span {
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color: red;
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}
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</style>
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</head>
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<body>
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<main class="container wrapper">
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<section>
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<h2>Reset Password</h2>
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<p>Please fill out this form to reset your password.</p>
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<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">
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<div class="form-group <?php echo (!empty($new_password_err)) ? 'has-error' : ''; ?>">
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<label>New Password</label>
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<input type="password" name="new_password" class="form-control" value="<?php echo $new_password; ?>">
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<span class="help-block"><?php echo $new_password_err; ?></span>
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</div>
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<div class="form-group <?php echo (!empty($confirm_password_err)) ? 'has-error' : ''; ?>">
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<label>Confirm Password</label>
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<input type="password" name="confirm_password" class="form-control">
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<span class="help-block"><?php echo $confirm_password_err; ?></span>
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</div>
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<div class="form-group">
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<input type="submit" class="btn btn-block btn-primary" value="Submit">
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<a class="btn btn-block btn-link bg-light" href="welcome.php">Cancel</a>
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</div>
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</form>
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</section>
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</main>
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</body>
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</html>

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