Question

In: Computer Science

Create a web page using PHP that allows the users to create an account (a username...

Create a web page using PHP that allows the users to create an account (a username and a password). There should be a login page that allows users to create an account by entering their preferred username and password. The same page should also let users login if they already have an account. If a user is logged in successfully , they should be able to enter a comment and also read the comments entered by others previously.

Expert Solution

PHP Login System Requirements:

We should have knowledge of HTML, CSS, PHP and MySQL for creating the login system.
Text Editor - For writing the code. We can use any text editor such as Notepad, Notepad++, Dreamweaver, etc.
XAMPP - XAMPP is a cross-platform software, which stands for Cross-platform(X) Apache server (A), MySQL (M), PHP (P), Perl (P). XAMPP is a complete software package, so, we don't need to install all these separately.

Setup

Now, we need to start the webserver and create the files for the login system. There are a few steps that are given below to set up the environment.

Open the XAMPP Control Panel.
Start the Apache server by clicking on the Start button.
Start the MySQL by clicking on the Start button.
Create all the files needed for login.
Create login table in the database using phpMyAdmin in XAMPP.

Now, we will create four files here for the login system.

index.html:This file is created for the GUI view of the login page and empty field validation.
style.css: This file is created for the attractive view of the login form.
connection.php: Connection file contains the connection code for database connectivity.
authentication.php:This file validates the form data with the database which is submitted by the user.

Save all these files in the htdocs folder inside the Xampp installation folder. The step by step description and code for these files are discussed below.

Step 1: Creating the Database Table

CREATE TABLE users (
id INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
username VARCHAR(50) NOT NULL UNIQUE,
password VARCHAR(255) NOT NULL,
created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

Step 2: Creating the Config File

<?php
/* Database credentials. Assuming you are running MySQL
server with default setting (user 'root' with no password) */
define('DB_SERVER', 'localhost');
define('DB_USERNAME', 'root');
define('DB_PASSWORD', '');
define('DB_NAME', 'demo');

/* Attempt to connect to MySQL database */
$link = mysqli_connect(DB_SERVER, DB_USERNAME, DB_PASSWORD, DB_NAME);

// Check connection
if($link === false){
die("ERROR: Could not connect. " . mysqli_connect_error());
}
?>

Step 3: Creating Login Page

<html>
<head>
<title>PHP login system</title>
// insert style.css file inside index.html
<link rel = "stylesheet" type = "text/css" href = "style.css">
</head>
<body>
<div id = "frm">
<h1>Login</h1>
<form name="f1" action = "authentication.php" onsubmit = "return validation()" method = "POST">
<p>
<label> UserName: </label>
<input type = "text" id ="user" name = "user" />
</p>
<p>
<label> Password: </label>
<input type = "password" id ="pass" name = "pass" />
</p>
<p>
<input type = "submit" id = "btn" value = "Login" />
</p>
</form>
</div>
// validation for empty field
<script>
function validation()
{
var id=document.f1.user.value;
var ps=document.f1.pass.value;
if(id.length=="" && ps.length=="") {
alert("User Name and Password fields are empty");
return false;
}
else
{
if(id.length=="") {
alert("User Name is empty");
return false;
}
if (ps.length=="") {
alert("Password field is empty");
return false;
}
}
}
</script>
</body>
</html>

Step 4: Creating a CSS File for Designing

body{
background: #eee;
}
#frm{
border: solid gray 1px;
width:25%;
border-radius: 2px;
margin: 120px auto;
background: white;
padding: 50px;
}
#btn{
color: #fff;
background: #337ab7;
padding: 7px;
margin-left: 70%;
}

How to run the login form?

To run the login form, open the xampp control panel and run the apache server and PHP.
Now, type localhost/xampp/folder name/file name in the browser and press Enter key.
All setup is done now. Enter the username and password in the login form and click the login button.

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