? PHP Comments

? Quick Overview

Comments in PHP are used to explain the code and make it more readable. They are ignored by the PHP engine during execution.

? Key Concepts

Single-line comment: Starts with // or #.
Multi-line comment: Enclosed between /* */.

? Syntax & Theory

PHP supports both single-line and multi-line comments. Comments are not executed and help developers understand code logic.

? Code Example

? View Code Example

// PHP comment examples demonstrating all comment types
<?php
// This is a single-line comment
# This is also a single-line comment

/* This is a
multi-line comment */

echo "Hello World!"; // Print a message
?>

? Live Output / Explanation

Only the echo statement runs. All commented lines are ignored by the PHP engine.

? Interactive Comment Playground

Toggle the checkboxes to see how the PHP Engine treats different lines of code.

Line 1 (// Comment) IGNORED

Line 2 (echo statement) EXECUTED

Line 3 (/* Block */) IGNORED

// $userName = "Alex"; echo "Welcome to PHP!"; /* Temporary debug code removed */

Engine Perspective: echo "Welcome to PHP!";

? Interactive Understanding

Try commenting and uncommenting different lines in your editor to observe how PHP ignores commented code during execution.

? Use Cases

Explaining complex logic
Documenting functions and files
Temporarily disabling code while testing

✅ Tips & Best Practices

Use comments to describe important logic
Keep comments short and meaningful
Update comments when code changes

? Try It Yourself

Create a file comments.php
Add both single-line and multi-line comments
Use echo to test which lines execute