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Table of Contents
How to use PHP multi-line comment correctly
Common uses of multi-line comments
The difference between single line comments
Home Backend Development PHP Tutorial PHP Multi-Line Comment Syntax

PHP Multi-Line Comment Syntax

Jul 17, 2025 am 03:42 AM
php Comment

PHP multi-line comments use /* and */ package content. 1. Start with /* and end with */, and can span multiple lines; 2. The comment content will not be executed, suitable for explanation logic or temporary blocking code; 3. It cannot be used in nested, otherwise it will lead to syntax errors; 4. It is often used in scenarios such as function descriptions, author version descriptions, etc., and documents can be generated with tools; 5. Different from single-line comments (// or #), the latter is only suitable for single-line short descriptions. Mastering these key points makes the code more standardized and easy to maintain.

PHP Multi-Line Comment Syntax

Writing PHP multi-line comments is actually quite straightforward, the key is to use the right symbols. Many people tend to confuse the difference between single-line and multi-line comments at the beginning. In fact, as long as you remember the /* */ structure, you will not make any mistakes.

PHP Multi-Line Comment Syntax

How to use PHP multi-line comment correctly

PHP's multi-line comments start with /* and end with */ . Its biggest feature is that it can span multiple lines. No matter how much content is written in the middle, it will be processed as annotations and will not be executed.

For example:

PHP Multi-Line Comment Syntax
 /*
This is the first line comment This is the second line and more*/

This content will be ignored when the program is running. You can also write some code blocks that you don't use for the time being, so that you can restore it later.

Note: It cannot be used in nesting. For example, if you write another /* ... */ in a paragraph /* ... */ comment, it will cause syntax errors.

PHP Multi-Line Comment Syntax

Common uses of multi-line comments

In addition to using multiple lines to illustrate code logic, there are also some practical application scenarios:

  • Temporarily blocking a piece of code is particularly useful when debugging
  • Write a file or function header description, such as author, version, function description
  • Generate document comments (with tools such as phpDocumentor)

For example, you can write a function description like this:

 /*
 * Calculate the sum of two numbers* @param int $a First number* @param int $b Second number* @return int Sum of two numbers*/
function add($a, $b) {
    return $a $b;
}

Although this format is not mandatory, many teams will adopt similar specifications to improve readability.

The difference between single line comments

There are two common annotation methods in PHP:

  • For single line comments // or #
  • For multiple lines of comments /* */

The difference is obvious:

  • Single line comments can only be written in one line, suitable for short descriptions
  • Multi-line comments are suitable for large paragraphs of text or blocking multiple lines of code
  • # and // in terms of function, but it is generally recommended to use //

One thing to note is that in HTML mixed output, using // will not output to the front end, but if you use HTML comment <!-- --> , it will be displayed in the web page source code.

Basically that's it. Multi-line comments are a very practical tip when writing code. Although it is simple, it is easy to ignore details, such as not nesting or spelling the wrong symbols. After mastering it, the code you wrote also looks more professional.

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