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PHP - The Language of the Web

PHP stands for Hypertext Preprocessor. Unlike Python or Java, which were made for general computing, PHP was created specifically for Web Development.

It was the first language that allowed developers to easily mix "Logic" (Backend) with "HTML" (Frontend) in the same file. Today, it powers WordPress, Wikipedia, and Facebook.

🧐 What is PHP?​

PHP is a Server-Side Scripting language.

When a user visits a PHP page, the server executes the PHP code, turns it into plain HTML, and sends that HTML to the browser. The user never sees the actual PHP code; they only see the result.

Why Choose PHP?​

  1. Hosting is Everywhere: You can find a $2/month server that runs PHP perfectly. It is the easiest language to "Deploy" (put online).
  2. WordPress Power: 40%+ of all websites use WordPress. If you know PHP, you can build custom themes and plugins for a massive market.
  3. The Laravel Revolution: Many people thought PHP was "old," but Laravel (a modern PHP framework) changed everything. It is now considered one of the most beautiful and developer-friendly ways to build apps.
  4. Built for the Web: PHP has built-in functions for handling HTML forms, cookies, and sessions that other languages require extra libraries for.

How it Looks: Mixing with HTML​

This is why beginners love PHP. You can take a standard HTML file and just "drop" some logic into it using <?php ... ?> tags.

index.php
<!DOCTYPE html>
<html>
<body>

  <h1>Welcome to my Store</h1>

  <?php
    $visitor_name = "CodeHarborHub Student";
    $hour = date("H");

    if ($hour < 12) {
        echo "<p>Good morning, $visitor_name!</p>";
    } else {
        echo "<p>Good afternoon, $visitor_name!</p>";
    }
  ?>

</body>
</html>

Key Detail: The Dollar Sign $​

In PHP, every variable must start with a $. It makes them very easy to spot in your code. Also, unlike Python, PHP uses semicolons ; at the end of every line, similar to JavaScript and Java.

Modern PHP: Laravel​

If you want to build a "Modern" app (like a clone of Twitter or Airbnb), you wouldn't use "Raw PHP." You would use Laravel.

Laravel handles the difficult parts of web development for you:

  • Routing: Simple URLs like /profile/username.
  • Eloquent (ORM): Talking to your database using simple English-like code instead of complex SQL.
  • Blade: A powerful templating engine to make your HTML clean.

Official & Documentation​

  • PHP.net: The official manual. It’s famous for having great user comments with code examples.
  • Laravel.com: The gold standard for framework documentation.

Free Courses​

Tools​

  • XAMPP / MAMP: Software that lets you run a PHP server on your own computer with one click.

Summary Checklist​

  • I understand that PHP turns into HTML before it reaches the browser.
  • I know that PHP variables always start with a $.
  • I recognize that PHP powers the majority of CMS platforms like WordPress.
  • I understand that Laravel is the modern way to build PHP applications.
A Note on History

You might hear people say "PHP is dead." Don't believe them. While it isn't the "trendiest" language on Twitter, it still runs 75% of the web and has some of the highest-paying freelance opportunities in the industry.

Last updated on by Ajay Dhangar