💬 PHP Comments

In PHP, a comment is a block of text or note written solely for documentation and developer explanation. Comments are completely ignored by the PHP parser during code execution and are never rendered to the web browser.

• Enhances Readability: Clarifies complex business logic and algorithms.
• Developer Reminders: Allows leaving TODO notes or references for yourself.
• Team Collaboration: Helps other team members understand function parameters and codebase architecture quickly.
• Code Disabling (Debugging): Temporarily bypasses specific code execution without deleting lines.

PHP provides three standard syntax formats for writing comments:

1️⃣ Single-Line Comment (//)
The standard and most commonly used format for short inline notes.

<?php

// This is a single-line comment

echo "Hello PHP";

?>
				

2️⃣ Unix-Style Single-Line Comment (#)
An alternative single-line comment format derived from Perl and Shell script styles.

<?php

# This is also a single-line comment

echo "Hello PHP";

?>
				

3️⃣ Multi-Line Comment (/* */)
Designed for documenting entire functions, class headers, or long paragraph explanations across multiple lines.

<?php

/*

This is a

multi-line

comment example

*/

echo "Hello PHP";

?>
				

Using Comments Within Code Lines:

<?php

$age = 25; // User's age

echo $age;

?>
				

Commenting Out Code (Disabling Code):

<?php

// echo "This code will not run";

echo "This code will run";

?>
				

PHP comments only execute within <?php ... ?> tags and are strictly stripped out before output is sent to the client. HTML comments, on the other hand, are sent directly to the browser and can be inspected via page source.

<?php

// This is a PHP comment (Hidden from browser source)

?>

<!-- This is an HTML comment (Visible in page source) -->