Introduction to PHP – Setup, Syntax, and Your First Script

PHP is one of the most widely used server-side scripting languages in the world. It powers millions of websites, from small blogs to large-scale applications like Facebook (in its early days) and WordPress. If you’re new to web development, PHP is a great starting point because it’s easy to learn yet powerful enough to build complex applications.

What is PHP?

PHP stands for Hypertext Preprocessor. It is a server-side scripting language designed to build dynamic and interactive web applications.

Key characteristics of PHP include:

Server-side execution: Code runs on the server, and the result (usually HTML) is sent to the browser.
Cross-platform: Runs on Windows, Linux, and macOS.
Open-source: Free to use with a strong global community.
Database integration: Works easily with databases like MySQL, PostgreSQL, and MariaDB.
Embedding in HTML: You can write PHP directly inside HTML files.

Setting Up PHP

Before writing PHP, you need to set up an environment. There are several approaches:

Option 1: Local Server Packages (Beginner Friendly)

Tools like XAMPP, WAMP, MAMP, or Laragon provide everything you need:

Apache (web server)
PHP (scripting language)
MySQL (database)

Steps (using XAMPP as an example):

Download XAMPP.
Install it on your system.
Start Apache (for PHP) and MySQL (for databases).
Place your .php files in the htdocs folder.

Visit http://localhost/filename.php in your browser.

Option 2: Install PHP Manually

For developers who want more control:

Download PHP from php.net.
Add PHP to your system’s PATH.
Run PHP scripts from the terminal:

php filename.php

Option 3: Online PHP Sandboxes

Websites like 3v4l.org or PHP Fiddle allow you to test PHP code without installing anything.

Writing Your First PHP Script

Create a file named index.php in your server’s root directory (htdocs for XAMPP).

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

Now visit:

http://localhost/index.php

You should see:

Hello, World!

This is the classic beginner’s script, confirming that PHP is working.

PHP Embedded in HTML

One of PHP’s strengths is mixing logic with HTML. Example:

<!DOCTYPE html>
<html>
<head>
  <title>My First PHP Page</title>
</head>
<body>
  <h1><?php echo "Welcome to PHP!"; ?></h1>
  <p>Today’s date is: <?php echo date("Y-m-d"); ?></p>
  <p>The time now is: <?php echo date("H:i:s"); ?></p>
</body>
</html>

Output in the browser:

Displays a dynamic heading.
Shows today’s date and current time.

Understanding PHP Syntax

PHP code is written inside <?php ... ?> tags.

Basic Rules:

Every statement ends with a semicolon (;).
Whitespace doesn’t matter but improves readability.
PHP code can be mixed with HTML.

Example:

<?php
  echo "Line 1";
  echo "Line 2";
?>

Comments in PHP

Comments are ignored by the interpreter but helpful for developers.

<?php
  // This is a single-line comment

  # Another single-line comment

  /*
    This is a multi-line comment.
    Useful for long explanations.
  */
?>

PHP Execution Flow

User requests a PHP page (index.php).
The server processes PHP code.
PHP generates HTML (or JSON, XML, etc.).
The server sends the result to the browser.

Example:

index.php

<?php
  echo "<h1>Hello, User!</h1>";
?>

Browser receives only:

<h1>Hello, User!</h1>

The PHP code itself is never visible to the browser.

Why Learn PHP Today?

Even with new frameworks and languages, PHP remains relevant because:

It powers WordPress, Drupal, Joomla, Magento, and more.
It integrates easily with databases and APIs.
Hosting for PHP is widely available and affordable.
Frameworks like Laravel make building apps faster and more secure.

Conclusion

In this first post, we covered:

What PHP is and why it’s important.
How to set up PHP (local server, manual install, or online sandbox).
Writing and running your first script.
Embedding PHP in HTML.
Basic PHP syntax and comments.
How PHP works behind the scenes.

In the next post, we’ll dive into variables, data types, and operators — the building blocks of programming in PHP.