PHP multi-line comments are used //wrapped content, suitable for explanation logic or blocked code; it is recommended that PHPDoc style be used for function and class comments to improve IDE recognition and development efficiency; comments should be clear and useful, avoid redundancy, and focus on explaining the reasons for implementation rather than the operation itself. For example: / Comment content/or /* PHPDoc comments/defines function parameters and return values, and pay attention to closing symbols to avoid syntax errors. Good comments need to be combined with context to help understand complex logic or special handling methods.
It is actually quite common to write PHP multi-line comments, especially when you need to specify the purpose of a certain piece of logic, function, or temporary blocking of code. The key is to use the right syntax while keeping the comments clear and useful.
Use /* */ to write multi-line comments
This is the most standard way. Any content wrapped by /* and */ in PHP will be regarded as comments and will not be executed.
for example:
/*
This is an example of multi-line comments.
It is mainly used to explain the function of a function.
Or explain a complicated logic process.
*/ This writing method is suitable for use above functions or at the beginning of a module to illustrate the overall structure and purpose. Be careful not to forget to close the symbol */ , otherwise it may cause syntax errors or even blank pages.
Document block style: Used with PHPDoc
If you are writing comments for functions, classes or methods, it is recommended to use PHPDoc style, which is a standardized comment format that not only supports multiple lines, but can also be automatically recognized by the IDE to improve development efficiency.
Example:
/**
* Calculate the user's age and return the result*
* @param string $birthdate The user's date of birth, in the format YYYY-MM-DD
* @return int Return to the user's current age*/
function calculateAge($birthdate) {
// Function implementation}Such annotations are not only good-looking, but also help the IDE prompt parameter types, automatic completion, etc. It is recommended to use this method uniformly when writing public functions or teamwork projects.
The more comments, the better, the key is to be clear and useful
Sometimes we see some "nonsense" comments, such as:
/*
Set the title*/
$title = "Homepage";This kind of comment is not very meaningful, but it makes the code even more messy. A truly useful comment should explain why it is done , not what it is done . For example:
/*
Here, we first determine whether it is a timestamp before using strtotime.
It is to be compatible with the stored timestamp format in old data.
*/
if (!is_numeric($time)) {
$time = strtotime($time);
}Such comments can help people who are maintained to understand the logic behind it, rather than just guessing the intention of the code.
Basically that's it. It is not difficult to write good comments, but to write really helpful comments, you still have to be a little patient and think.
The above is the detailed content of PHP: Writing Multi-Line Code Comments. For more information, please follow other related articles on the PHP Chinese website!
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