Alaa Amer

Lesson 3: PHP Comments

What Are Comments in PHP?

Comments in PHP are lines ignored during execution. They serve to explain code, remind developers of purposes, or document specific logic. While they don’t affect output, they greatly improve code clarity.

Types of PHP Comments

PHP supports three main types of comments:

1. Single-line Comment

Begins with // or #. It’s used for brief notes on a single line.

// This is a single-line comment 
# This is also a single-line comment

2. Multi-line Comment

Starts with /* and ends with */. It is suitable for longer explanations.

/* This is a multi-line comment It can 
span across several lines */

Why Are Comments Important?

Comments are essential in professional development. In team projects, they:

• Improve collaboration

• Help new developers understand the code

• Document decisions or logic behind complex parts

Tips for Writing Useful Comments

• Keep them short and clear

• Avoid repeating what’s obvious

• Use a consistent language

• Update comments when the code changes

Do Comments Affect Performance?

No, they don’t. The PHP engine ignores comments during execution. However, excessive or outdated comments can cause confusion.

More Use Cases for Comments

• Temporarily disable parts of code

• Leave notes like TODO for future tasks

• Add personal remarks or warnings

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✅ Conclusion

PHP comments are powerful when used wisely. They boost understanding, maintainability, and teamwork. Always strike a balance between code and commentary for optimal development.

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