What is PHP?
PHP (Hypertext Preprocessor) is a server-side scripting language mainly used to create dynamic and interactive web pages. PHP scripts are executed on the server, and the result is sent to the browser as HTML.
Key Features of PHP
- Open-source and free
- Easy to learn for beginners
- Works well with HTML
- Supports databases like MySQL, PostgreSQL, Oracle
- Platform independent (Windows, Linux, macOS)
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History of PHP
- 1994: PHP was created by Rasmus Lerdorf
- Initially called Personal Home Page Tools
- Used to track visits to his online resume
- Later rewritten and expanded to support databases
- PHP became very popular for web development
Important Timeline
| Year | Event |
|---|---|
| 1994 | PHP created |
| 1995 | PHP Tools released publicly |
| 1997 | PHP/FI introduced |
| 1998 | PHP 3 released |
| 2000 | PHP 4 released |
| 2004 | PHP 5 released |
| 2015 | PHP 7 released |
| 2020 | PHP 8 released |
Exam Tip: PHP was created by Rasmus Lerdorf in 1994.
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Versions of PHP and Differences
PHP 3
- First official version
- Introduced server-side scripting
- Limited features
PHP 4
- Improved performance
- Introduced Zend Engine
- Better handling of variables
PHP 5
- Introduced Object-Oriented Programming (OOP)
- Better database support
- XML and exception handling added
PHP 7
- Major performance improvement
- Faster execution
- Reduced memory usage
- Removed old and unused features
PHP 8
- Just-In-Time (JIT) compiler
- Improved error handling
- New syntax features
- Better security
Difference Summary Table
| Feature | PHP 5 | PHP 7 | PHP 8 |
|---|---|---|---|
| Speed | Moderate | Fast | Very Fast |
| OOP Support | Yes | Yes | Advanced |
| Memory Usage | High | Low | Lower |
| Error Handling | Basic | Improved | Strong |
Exam Tip: PHP 7 and PHP 8 are faster and more secure than older versions.
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Practicality of PHP
PHP is very practical for real-world web applications.
Why PHP is Practical?
- Easy integration with HTML
- Large community support
- Runs on most servers
- Supports many databases
- Used in real websites like:
- Facebook (initially)
- Wikipedia
- WordPress
Common Uses
- Login systems
- Registration forms
- E-commerce websites
- Content Management Systems (CMS)
- Dynamic web pages
Exam Point: PHP is practical because it is easy to use, flexible, and widely supported.
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Power of PHP
PHP is considered powerful because it can handle both simple and complex web applications.
What Makes PHP Powerful?
- Handles form data easily
- Session and cookie management
- File handling on server
- Database connectivity
- Supports OOP concepts
- Secure with encryption and hashing
PHP Can
- Generate dynamic page content
- Create, read, update, delete files
- Collect form data
- Send and receive cookies
- Control user access
Exam Line: PHP is powerful due to its database support, server control, and scalability.
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Installation and Configuring Apache and PHP
To run PHP, we need:
- Web Server (Apache)
- PHP Interpreter
- Browser
Option 1: Using XAMPP (Recommended for Beginners)
XAMPP includes:
- Apache Server
- PHP
- MySQL
- phpMyAdmin
Steps to Install XAMPP
- Download XAMPP from official website
- Install XAMPP
- Open XAMPP Control Panel
- Start Apache
- Check by opening:
http://localhost
Testing PHP
Create a file named test.php inside htdocs folder:
<?php
echo "Hello PHP";
?>Open in browser: http://localhost/test.php
Option 2: Manual Installation (Theory Point)
Steps
- Install Apache Server
- Install PHP
- Configure
php.ini - Link PHP with Apache
- Restart Apache server
Exam Tip: XAMPP is commonly used for PHP development because it is easy to install and configure.
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Advantages of PHP
- Free and open source
- Easy learning curve
- Fast execution
- Cross-platform
- Large documentation
Limitations of PHP
- Not suitable for desktop applications
- Security depends on proper coding
- Slower than compiled languages