Welcome to Commonlounge's PHP Class. This is a 23-part course which will teach you PHP from scratch. It's designed to be very hands-on and will walk you through every step of the process.

You don't need to have any previous knowledge of programming or PHP! The only prerequisite for this course is some basic knowledge of HTML.

The course is divided into five sections — set-up an...

So far you have seen how PHP dynamically produces HTML (front-end). Now we will look at how PHP interacts with MySQL (back-end). You will learn how to connect to a database and execute data manipulation statements like INSERT, UPDATE and DELETE using PHP.

phpMyAdmin

phpMyAdmin is a free software tool written in PHP, intended to handle the administration of MySQL over the Web. It provides a user interface through which frequently used operations can be performed, while you still have the ability to directly execute any SQL statement. phpMyAdmin comes preinstalled with XAMPP.

When you installed XAMPP, you would have seen that the database that came along with it was called MariaDB and not MySQL. Both MariaDB and MySQL are very similar and can be used interchangeably. In fact, MariaDB is a fork of the MySQL open source project. This a...

In this tutorial, you'll learn about Object Oriented Programming, or OOP for short. OOP allows you to create large projects while still keeping things easy to understand.

Class and Object

The world around is made of up different types of objects - planets, cars, computers, animals, and so on. In OOP, a type of object is represented by a class. Specific planets - such as Earth, Mars, Jupiter, etc and specific cars such as your car, my car, and the taxi driving by outside your house are each represented by an object.

In programming, a class is a programmer-defined data-type. A class contains some data, and methods / functions to use that data.

Let's look at how to define a class. First we have to define a PHP class, where the name of the class should be (preferabl...

Previously in the course, you learnt about forms in PHP: Superglobals and Forms. In this tutorial you are going to learn about (a) how to make sure your website remains safe and secure from hackers when you accept form input and (b) how to provide a user helpful messages when they fill a form incorrectly.

PHP Form Security

Let's quickly create a simple form in PHP:

<!-- form.php -->
<?php 
    if (isset($_POST['signup'])) {
        $username = $_POST['username'];
        $password = $_POST['password'];
        $email = $_POST['email'];
    }
?>
<form method="post">
    <h3>Form</h3>
    <input type="text" name="username" placeholder="Username"/>