PHP (Hypertext Preprocessor) is an open-source, server-side scripting language designed specifically for web development. PHP code runs on the web server, executes business logic, interacts with databases, and dynamically generates HTML before sending the final response to the user's browser.
PHP operates strictly on the backend (server-side). The client browser never receives raw PHP code—only the generated HTML, JSON, or media output.
flowchart LR
A["HTTP Request (Browser)"] --> B["Web Server (Nginx / Apache)"]
B --> C["PHP-FPM Engine"]
C --> D["Database (MySQL / PostgreSQL)"]
D --> C
C --> E["Generated HTML / JSON Response"]
E --> A
Key features of modern PHP (PHP 8.x):
<?php
// Modern PHP 8 Script Example
$serverTime = date('Y-m-d H:i:s');
$userRole = 'Administrator';
$features = ['Authentication', 'Database ORM', 'API Routing'];
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>PHP Intro Demonstration</title>
</head>
<body style="font-family: system-ui, sans-serif; background: #0f172a; color: #f8fafc; padding: 2rem;">
<h1>PHP Server Information</h1>
<p>Server Timestamp: <strong><?= $serverTime ?></strong></p>
<p>User Privilege level: <span><?= htmlspecialchars($userRole) ?></span></p>
<h2>Active System Modules</h2>
<ul>
<?php foreach ($features as $feature): ?>
<li><?= htmlspecialchars($feature) ?></li>
<?php endforeach; ?>
</ul>
</body>
</html>
<?= ?> for Template Rendering: Clean and readable for inline variable output in template views.htmlspecialchars(): Prevents Cross-Site Scripting (XSS) when rendering dynamic server data in HTML.Create a PHP script that checks the current hour of the day using date('H') and prints "Good Morning" if the hour is less than 12, or "Good Day" otherwise!
Sign in to track your learning journey, earn industry-recognized certificates, and join our elite developer community.
Quick Access With
Experiment with the code from this lesson in our interactive playground.