PHP
🔹 What is PHP?
PHP (Hypertext Preprocessor) is a server-side scripting language used to create dynamic and interactive websites. It is mainly used in web development to handle data, connect to databases, and generate HTML content dynamically.
🔹 Definition
PHP is a programming language that runs on the server and helps in building web applications by processing user requests and sending the result to the browser.
👉 It works closely with databases like MySQL to store and retrieve data.
🔹 History of PHP
PHP was created by Rasmus Lerdorf in 1994 as a simple tool to manage web pages. Over time, it evolved into a powerful programming language.
🔹 Key Features of PHP
1. Open Source
- Free to use
- Large community support
2. Server-Side Language
- Runs on the server, not in the browser
3. Easy to Learn
- Simple syntax, especially for beginners
4. Platform Independent
- Works on Windows, Linux, macOS
5. Database Integration
- Easily connects with databases like MySQL
6. Fast Execution
- Efficient for web applications
🔹 How PHP Works
- User sends request from browser
- PHP code runs on the server
- Server processes the request
- Output is sent back as HTML
👉 Flow:
Browser → Server (PHP) → Database → Response → Browser
🔹 Basic PHP Example
echo “Hello, World!”;
?>
👉 This code displays “Hello, World!” on a webpage.
🔹 PHP vs HTML
| Feature | PHP | HTML |
|---|---|---|
| Type | Programming Language | Markup Language |
| Runs on | Server | Browser |
| Use | Dynamic content | Static content |
🔹 Uses of PHP
- Dynamic websites
- E-commerce platforms
- Content Management Systems
- Web applications
- APIs and backend services
👉 Popular platforms using PHP:
- WordPress
- Facebook (initially built using PHP)
🔹 Advantages of PHP
- Easy to learn and use
- Free and open source
- Works well with databases
- Fast development time
- Huge community support
🔹 Disadvantages of PHP
- Less secure if not coded properly
- Can become messy in large projects
- Slower than some modern frameworks (in certain cases)
🔹 PHP with Database Example
$conn = mysqli_connect(“localhost”, “root”, “”, “test”);
$result = mysqli_query($conn, “SELECT * FROM students”);
while($row = mysqli_fetch_assoc($result)) {
echo $row[‘name’];
}
?>
👉 This code connects to a MySQL database and fetches student names.
🔹 Real-Life Example
When you log in to a website:
- PHP checks your username and password
- Fetches data from database
- Shows your dashboard
🔹 Conclusion
PHP is a powerful and widely-used server-side language for web development. It is especially popular for building dynamic websites and backend systems due to its simplicity and strong database support.