• +91-9142290450

  • Hajipur, Bihar, 844101

☰
❮
❯

PHP Introduction

Next →

PHP (PHP: Hypertext Preprocessor) is a popular server-side scripting language used to create dynamic and interactive web pages. It’s simple to learn, works on almost any platform, and powers millions of websites — including WordPress and Facebook.

If you want to build websites that can talk to databases, handle user input, or generate custom content, PHP is a great place to start.

What Is PHP?

PHP is a scripting language that runs on the web server instead of the user’s browser. When someone visits a PHP page, the PHP code runs first on the server and produces HTML output. This HTML is then sent to the browser.

In short:

  • PHP code → executed on the server

  • Browser → receives only the HTML output

Here’s a simple example:

<?php
echo "Hello, World!";
?>

Output in the browser:

Hello, World!

But if you view the page source, you’ll only see the HTML result — the PHP code stays hidden.

Why Use PHP?

Developers love PHP because it’s:

  • Free and open-source – No license fees or subscriptions.

  • Beginner-friendly – The syntax is simple and forgiving.

  • Cross-platform – Runs on Windows, Linux, and macOS.

  • Database-friendly – Connects easily with MySQL, PostgreSQL, and others.

  • Widely supported – Works smoothly with popular web servers like Apache and Nginx.

In short, PHP makes it easy to create web pages that change based on user input or database content.

Real-World Examples of PHP

Many well-known websites and platforms run on PHP, such as:

  • WordPress – The world’s most used CMS.

  • Wikipedia

  • Facebook (originally built in PHP)

  • Drupal and Joomla

  • Frameworks like Laravel and CodeIgniter

This shows how scalable and reliable PHP can be — from small blogs to enterprise-level applications.

How PHP Works Behind the Scenes

Understanding how PHP runs helps you see what makes it “server-side.”

  1. A visitor opens a PHP page (like index.php) in their browser.

  2. The web server receives this request.

  3. The PHP engine processes the file on the server.

  4. PHP code executes and generates HTML.

  5. The final HTML is sent back to the user’s browser.

So the visitor only sees the output, not the PHP code itself.

How PHP and HTML Work Together

PHP blends perfectly with HTML. You can write HTML normally and drop PHP code blocks where needed.

Example:

<!DOCTYPE html>
<html>
<head>
  <title>My First PHP Page</title>
</head>
<body>
  <h1>Welcome!</h1>
  <p>
    <?php
      echo "Today is " . date("l");
    ?>
  </p>
</body>
</html>

Output:

Welcome!
Today is Tuesday

This mix allows you to create pages that feel alive — changing with time, user input, or database data.

What Can You Do with PHP?

PHP can handle almost everything a dynamic website needs:

  • Form handling: Collect data from users and process it.

  • Database operations: Add, edit, or fetch data (CRUD).

  • Sessions and cookies: Manage user logins or preferences.

  • File handling: Upload or create files on the server.

  • Server-side validation: Validate data before saving it.

  • API integration: Connect with services like PayPal or Google Maps.

  • Generate dynamic content: Display personalized content for each user.

PHP Versions and Evolution

PHP has grown a lot since it was created by Rasmus Lerdorf in 1994.

Version Release Year Key Features
PHP 4 2000 Basic OOP support
PHP 5 2004 Full object-oriented programming
PHP 7 2015 Huge performance boost, scalar types
PHP 8 2020 JIT compiler, match expressions, named arguments

If you’re learning today, always install PHP 8 or above for better speed, stability, and security.

Advantages of PHP

Let’s look at what makes PHP still relevant in 2025:

  1. Easy to learn and code: The syntax is straightforward and similar to C or JavaScript.

  2. Fast execution: PHP 8 is highly optimized for performance.

  3. Cross-platform support: Works on Linux, macOS, and Windows.

  4. Database integration: MySQL, MariaDB, PostgreSQL, and more.

  5. Huge community: Millions of developers and tons of online resources.

  6. Framework support: Frameworks like Laravel make development even faster.

Disadvantages of PHP

A fair look at PHP includes its downsides too:

  • Security risks: Poorly written code can be vulnerable.

  • Inconsistent function names: Some functions have underscores, others don’t.

  • Mixing HTML and PHP can get messy: Large projects need proper structure.

  • Less modern syntax: Compared to newer languages like Node.js or Python, but frameworks fix most of this.

With clean coding habits and frameworks, most of these issues are easy to avoid.

PHP File Basics

All PHP files end with the .php extension.

Each PHP block starts with <?php and ends with ?>.

Example:

<?php
echo "This is a PHP block.";
?>

A single file can contain multiple PHP blocks along with HTML, CSS, or JavaScript.

PHP in the Web Development Stack

PHP usually handles the backend logic in a traditional LAMP stack:

  • L – Linux (Operating System)

  • A – Apache (Web Server)

  • M – MySQL (Database)

  • P – PHP (Backend Language)

Together, this stack can run anything from small blogs to complex web apps.

Is PHP Still Relevant Today?

Yes — absolutely. Despite newer languages entering the scene, PHP remains a strong choice because:

  • It powers over 75% of websites with a known server-side language.

  • Frameworks like Laravel have modernized its structure.

  • It integrates easily with front-end tools and cloud hosting platforms.

  • It’s beginner-friendly, so it’s great for students and self-learners.

Summary: Why Learn PHP

PHP is one of the best starting points for backend web development. It’s easy, powerful, and practical. You’ll understand how websites process forms, store data, and serve dynamic pages — all using a free, open-source language.

If you’re serious about building your own website or becoming a full-stack developer, PHP gives you the foundation to grow quickly.

Practice Questions

  1. Write a PHP script that displays the text “Welcome to PHP Programming!” using the echo statement.

  2. Create a web page that shows a heading “My First PHP Page” using HTML, and inside a paragraph tag, print “This page was generated using PHP.” with a PHP block.

  3. In a single PHP file, display the text “Today’s date is Monday,” but make the day come from PHP using the date() function.

  4. Explain what happens when a PHP file is opened in a browser, and write a PHP example that prints “Server is working fine!” to show that PHP is running on the server.

  5. Write a PHP script that prints “Good Morning, Vicky!” where the name comes from a variable named $name.

  6. Create a valid PHP file named test.php that prints “This is a PHP file.” Also explain why the .php extension is required for the server to execute PHP code.

  7. Design a small PHP page that displays:

<h1>My Website</h1>
<p>Welcome to my homepage.</p>
<footer>Created on [current year]</footer>

Use HTML for structure and PHP to show the current year.

  1. Write a script that uses two separate PHP blocks in the same file — the first prints “PHP runs on the server.” and the second prints “HTML is displayed on the browser.”

  2. Create a PHP page for a simple blog homepage that displays:

<h2>Latest Blog Post</h2>
<p>Posted on [current date]</p>
<p>Author: [your name]</p>

Use PHP to show the date and author name dynamically.

  1. What will be the output of this code?

<?php
echo "PHP ";
echo "is ";
echo "awesome!";
?>

Also explain how the server processes this before sending it to the browser.

Next →

PHP

online coding class codepractice

PHP Basics

PHP Data

Control Flow

PHP Functions

PHP Arrays

PHP Forms

PHP Advanced

Cookies & Sessions

Filters & JSON

PHP Exceptions

PHP OOP

MySQL with PHP

PHP and XML

AJAX with PHP

codepractice logo
Login
Go Back Top