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Table of Contents
Why write comments?
What does a good comment look like?
What are the typical examples of bad comments?
Suggestions for writing comments
Home Backend Development PHP Tutorial Good vs. Bad PHP Comments

Good vs. Bad PHP Comments

Jul 18, 2025 am 04:55 AM
php Comment

Comments are crucial in code because they improve the readability and maintenance of the code, especially in projects like PHP that are multi-collaborative and long-term maintenance. Reasons for writing comments include explaining “why do this” to save debugging time and be friendly to newbies and reduce communication costs. The representation of good comments includes explaining the role of functions or classes to explain complex logic intent marking to-dos or potential problems, and writing API interface documentation annotations. Typical manifestations of bad comments include repeated code content comments that are inconsistent with code and using comments to cover up bad code and retaining old information. Suggestions for writing comments include prioritizing comments "why" keeping comments synced with code Use a unified format to avoid emotional statements and consider optimizing code rather than relying on comments when the code is difficult to understand.

Good vs. Bad PHP Comments

When writing code, comments are the part that many people tend to ignore but are also the most likely to affect readability. Especially in PHP, a language with flexible syntax and diverse project structure, good annotations can help people quickly understand logic, while bad annotations will make people more confused as they read .

Good vs. Bad PHP Comments

Why write comments?

PHP is a language commonly used in the web backend. Many times a project is completed by multiple people and has a long maintenance cycle. At this time, the comments are not only a reminder of yourself, but also a signpost for future people (including you in the future) .

  • Comments can explain "why did this" rather than just "what did"
  • Complex logic and special processing places, comments can save a lot of debugging time
  • Be friendly to novices and reduce communication costs

So don't underestimate a few lines of comments, it may be the first impression others will see when they look at your code.

Good vs. Bad PHP Comments

What does a good comment look like?

Good comments are not the more, the better, but should be concise, accurate and helpful . Here are some common good annotation practices:

  • Explain the function of a function or class

    Good vs. Bad PHP Comments
     /**
     * User login verification class* Process username and password matching and generate session
     */
    class Auth {}
  • The intention to explain complex logic

     // Because the order status may be updated by asynchronous callbacks, locking is required here to prevent concurrency problems if ($order->isLocked()) {
        return false;
    }
  • Tag to-dos or potential issues

     // TODO: It needs to support multilinguals, currently the default Chinese $greeting = "Hello";
  • API interface documentation comments

     /**
     * Get user information* @param int $userId User ID
     * @return array|false User data or failed to return false
     */
    function getUserInfo($userId) { ... }

These comments point to a core: let others know what you are doing at a glance, and you can understand logic without even having to go deep into the code .


What are the typical examples of bad comments?

Bad comments are not necessarily wrong, but they are often redundant, misleading, outdated or nonsense . The following are typical counterexamples:

  • Repeat the code content, meaningless

     $i ; // i add one
  • Comments and code are inconsistent

     // Get the article list $data = getCategories(); // But it is actually getting the classification
  • Cover the code with a bunch of comments

     // Start processing data foreach ($items as $item) {
        // determine whether it is valid if ($item['status'] == 1) {
            // Add to result $result[] = $item;
        }
    }
    // End processing of data

    This situation is actually more suitable for refactoring function names or variable names rather than "explaining" by comments.

  • The old comments are still in place

    For example, the function has changed its parameters, but the comments still contain the information of the old version, which is even more terrifying than noting.


Suggestions for writing comments

  • Prioritize annotation of "why" rather than "what did"
  • Keep comments and code updated synchronously
  • Use a unified format, such as PHPDoc, to write function comments
  • Avoid emotional or sarcastic statements (unless the team knows that this is the style)

If you don't even think it's easy to understand a piece of code, it's best to add a comment. But if you still feel it is trampled after adding comments, then you should consider whether the code itself should be optimized.

Basically that's it.

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