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Introduction of PHP

Introduction to PHP – Learn PHP from Scratch with Practical Examples

Welcome to your complete beginner’s guide to PHP. Whether you are starting your journey into web development or planning to become a backend developer, this tutorial will help you understand the foundation of PHP — one of the most widely used programming languages for dynamic websites.

At PHPOnline.in, we aim to make PHP simple, engaging, and job-ready for learners across all levels.

What you will Learn

  1. What is PHP?

  2. History of PHP

  3. Why Learn PHP in 2025?

  4. Key Features of PHP

  5. Installing PHP on Your Computer

  6. Running Your First PHP Script

  7. PHP Syntax Explained

  8. PHP Variables and Data Types

  9. PHP Comments

  10. PHP Constants

  11. PHP Operators

  12. Control Structures

  13. Introduction to Functions

  14. PHP and HTML Integration

  15. Real-World Use Cases

  16. PHP in CMS and Frameworks

  17. PHP in Comparison with Other Languages

  18. Tips for Beginners

  19. What’s Next?

  20. FAQ

What is PHP?

PHP (Hypertext Preprocessor) is a server-side scripting language designed for web development. It can be embedded within HTML and is used to manage dynamic content, databases, session tracking, and even build entire e-commerce sites.

✅ PHP is open-source and powers over 75% of websites, including WordPress, Wikipedia, and Facebook components.

History of PHP

PHP was created in 1994 by Rasmus Lerdorf. Initially named “Personal Home Page”, it evolved into PHP: Hypertext Preprocessor and became a full-fledged programming language by PHP 3 in 1998.

Today, with versions like PHP 8.3, it offers powerful features like:

  • Just-in-Time Compilation (JIT)

  • Attributes (Annotations)

  • Match expressions

🔗 Related: PHP Version Guide

Why Learn PHP in 2025?

Many wonder — is PHP still worth learning?
Absolutely! Here’s why:

  • Widely Used: Over 3 billion websites use PHP

  • Job Opportunities: Thousands of companies need PHP developers

  • CMS Platforms: WordPress, Drupal, Joomla are PHP-based

  • Simplicity: Easy to get started

  • Strong Community: Millions of active users

🔗 Read: Is PHP Still Relevant?

Key Features of PHP

  • Open Source

  • Platform Independent

  • Fast Execution

  • Database Integration (MySQL, PostgreSQL)

  • Supports OOP

  • Secure and Flexible

  • Rich Framework Support (Laravel, Symfony)

Installing PHP on Your Computer

Tools Required

  • XAMPP / WAMP / MAMP (for local development)

  • Text Editor (VS Code, Notepad++, Sublime)

  • Browser (Chrome, Firefox)

Steps to Install XAMPP:

  1. Download from apachefriends.org

  2. Install XAMPP

  3. Start Apache server

  4. Place your .php files in the htdocs folder

🔗 Step-by-step: Install PHP with XAMPP

Running Your First PHP Script

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

Explanation:

  • <?php opens PHP mode

  • echo prints output

  • Statements end with ;

Run this file in your browser using:
http://localhost/hello.php

PHP Syntax Explained

  • PHP scripts start with <?php and end with ?>

  • Statements end with a semicolon

  • PHP is case-insensitive for keywords (like echo, if)

  • Case-sensitive for variables ($Var1 ≠ $var1)

<?php
$number = 10;
echo $number;
?>

PHP Variables and Data Types

Syntax

$variableName = value;

Data Types

  • String: $name = "PHP";

  • Integer: $age = 20;

  • Float: $price = 10.5;

  • Boolean: $isOpen = true;

  • Array: $fruits = ["Apple", "Banana"];

  • Object: Created from classes

  • NULL: Represents no value

🔗 Explore more: PHP Variables and Constants

PHP Comments

// Single line comment
# Also a single line
/* Multi-line
comment */

Comments are ignored by the PHP interpreter and used to explain code logic.

PHP Constants

Constants cannot be changed once defined.

define("SITE_NAME", "PHPOnline");
echo SITE_NAME;

  • Defined using define()

  • Global scope

  • Case-sensitive by default

PHP Operators

Types:

  • Arithmetic: +, -, *, /, %

  • Assignment: =, +=, -=

  • Comparison: ==, !=, >, <

  • Logical: &&, ||, !

Control Structures

Used to make decisions and loops.

if ($age > 18) {
echo "Adult";
} else {
echo "Minor";
}

Loops:

  • for, while, do-while, foreach

Introduction to Functions

Functions allow code reusability:

function greet($name) {
return "Hello, $name!";
}
echo greet("PHP");

PHP and HTML Integration

PHP integrates directly with HTML to build dynamic websites.

<!DOCTYPE html>
<html>
<body>
<h1><?php echo "Welcome to PHP"; ?></h1>
</body>
</html>

Real-World Use Cases

PHP is used for:

  • Contact Forms

  • User Authentication

  • E-commerce Backends

  • CMS Development

  • API Integration

PHP in CMS and Frameworks

CMS Platforms:

  • WordPress

  • Drupal

  • Magento

Frameworks:

  • Laravel

  • CodeIgniter

  • Symfony

🔗 Related: PHP Frameworks Compared

PHP vs Other Languages

FeaturePHPPythonNode.js
Server-Side✅✅✅
SyntaxEasyBeginnerModerate
PerformanceModerateHighVery High
Hosting CostLowMediumHigh

Tips for Beginners

  • Practice every day

  • Build small projects

  • Read PHP documentation

  • Join PHP communities (Reddit, Stack Overflow)

  • Use version control (Git)

What’s Next?

After learning the basics, explore:

  • PHP with MySQL

  • Object-Oriented PHP

  • PHP Security

  • Laravel or WordPress Development

  • Build a CRUD Project

🔗 Start here: PHP with MySQL Course

FAQ – Introduction to PHP

Q1. What is PHP?

PHP is a server-side scripting language used to build dynamic web pages and web applications.

Q2. Is PHP hard to learn?

No. PHP has a simple and readable syntax that is beginner-friendly.

Q3. Can PHP run on Windows?

Yes. PHP works on Windows, Linux, and macOS.

Q4. Is PHP free to use?

Yes, PHP is completely free and open-source.

Q5. Can PHP connect to databases?

Absolutely. PHP supports multiple databases like MySQL, PostgreSQL, SQLite, etc.

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