Best Practices for PHP Multiline Comments
Jul 18, 2025 am 04:51 AMMulti-line comments should be used when functions, classes, file headers, etc. need to be described for a long time, and are suitable for segmented descriptions. It should include function description, parameter description @param, return value @return, optional tags such as @throws, @author, @version. The style needs to be unified. It is recommended to align each line and empty rows between labels, and combine PHPDoc specifications to improve readability and maintenance efficiency.
Although multi-line comments in PHP seem simple, using them well can not only improve code readability, but also reduce communication costs in team collaboration. Many people just write a few words of explanation. In fact, there are some notable best practices for multi-line comments that can make your code clearer and more professional.

When should I use multiple lines of comment?
Multi-line comments are not added casually, they are most suitable for use in functions, classes, and file headers where longer descriptions are required.
- It can be used at the top of the function to illustrate the purpose, parameters, return values and possible exceptions
- Before class definition, you can write a paragraph briefly to introduce the design intention or usage of this class.
- Copyright information, author, modification records, etc. can be added at the beginning of the file
For situations like this that require segmented explanations, single-line comments are not enough. Don't underestimate this information. When maintaining old projects, they are often the first step in understanding the code.

What key information should the comments contain?
A qualified multi-line comment should include at least the following:
- Function description: Explain clearly what this code is for in one sentence
- Parameter description (@param): Each parameter type and meaning must be written clearly
- Return value (@return): tell others what this function will return
- Optional tags such as @throws, @author, @version, etc. can also help document generation
For example:

/** * Calculate the user's current level experience sum* *Accumulate experience values based on user's historical operation record, and if the threshold is exceeded, it will be upgraded* * @param array $actions User action record array* @param int $baseExp Initial experience value cardinality* @return int User current total experience value* @throws InvalidArgumentException If the format of the incoming operation is not legal*/ function calculateUserExp(array $actions, int $baseExp): int { // ... }
Such annotations are not only understood by people, but also facilitate the tools to automatically generate API documents.
Unified style is very important, don't let comments get scrambled
Different developers may write comments in different ways, and it is recommended to unify the style in the team. for example:
- Use
*
to align each line to look neat - Parameter alignment layout makes reading easier
- A line between different labels makes the logic clearer
Some teams will also combine the PHPDoc specification, which will make the IDE experience better. If you use PhpStorm or VSCode, turning on the automatic completion annotation function can also save time.
In addition, don’t write the comments too much to avoid “nonsense literature”. For example, the comment "set title" is unnecessary unless there is complex logical processing behind it.
Basically that's it. Multi-line comments are a detailed and detailed writing, which is friendly to both yourself and later generations.
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