PHP Comments

Single-Line Comments

Single-line comments are used to comment out a single line of code. PHP supports two syntax styles for single-line comments:

• Double Slash: Use // to comment out the rest of the line.
• Hash Symbol: Use # to comment out the rest of the line (often used in shell scripts but also valid in PHP).

Examples:

// This is a single-line comment using double slash
# This is a single-line comment using hash symbol
echo "Hello, World!"; // This is an inline comment

Multi-Line Comments

Multi-line comments are useful for commenting out blocks of code or providing detailed explanations. PHP supports one syntax style for multi-line comments:

• Slash-Asterisk: Use /* ... */ to comment out multiple lines.

Example:

/* This is a multi-line comment
   It spans multiple lines
   and is used to provide more detailed explanations. */
echo "Hello, World!";

Commenting Best Practices

When using comments in your PHP code, follow these best practices:

• Be Clear and Concise: Ensure comments are easy to understand and relevant to the code.
• Avoid Redundancy: Don’t state the obvious. Focus on why something is done rather than what is done.
• Keep Comments Up-to-Date: Update or remove comments as the code changes to avoid confusion.
• Use Comments for Documentation: Use comments to explain complex logic or decisions in your code.