Comments In PHP
PHP comments are normally presented to us in a way that is intended to satisfy both our academic and practical needs.
PHP Comments
In PHP code, a comment is a line that is not included as part of the program. This is because PHP comments are designed not to appear in the program’s output.
In short, it is only designed to be read by a person who is looking at the code, and it has no other purpose.
You can use comments for the following purposes:
- The code you write should be understandable by other developers.
- Keep yourself re-acquainted with what you did– Many programmers have had the experience of coming back to some of the work they’ve done a few months or years later and having to re-learn from scratch what they’ve done.
- You can use comment in PHP to remind yourself what you were thinking when writing the code in the first place.
In PHP, comments can be supported in several different ways, such as the following:
In the case of single-line comments, the syntax is as follows when it comes to comment in PHP:
Example:
<!DOCTYPE html>
<html>
<body>
<?php
// Slashes use as single-line comment
# Hashtag can also use for single-line comment
?>
</body>
</html>
Example:
<!DOCTYPE html>
<html>
<body>
<?php
// To comment single-line
# Also use for commenting single-line
?>
</body>
</html>
In the case of multiple-line comments, the syntax is as follows:
Example:
<!DOCTYPE html>
<html>
<body>
<?php
/*
A multi-line comment block spans across multiple lines of text.
This comment block is made up of a number of lines of text
*/
?>
</body>
</html>
Example:
<!DOCTYPE html>
<html>
<body>
<?php
/*
Comment blocks that span multiple
lines of text are called multi-line comment blocks.
*/
?>
</body>
</html>
The following examples show how to use comments to remove parts of code:
Example:
<!DOCTYPE html>
<html>
<body>
<?php
// You can use comments to remove parts of code line
$a = 6 /* + 2 */ + 4;
echo $a;
?>
</body>
</html>
Example:
<!DOCTYPE html>
<html>
<body>
<?php
// Commenting is also a useful way to leave out certain parts of a code line when writing it
$a = 7 /* + 8 */ + 3;
echo $a;
?>
</body>
</html>
Php Comments Advantages:
- Improved code readability: The purpose of comments is to help others (and yourself) understand the code in the future by explaining specific parts of it.
- Debugging: For debugging purposes, comments can also serve as reminders or notes.
- Collaboration: Your code can be better understood by others when you leave comments in a team.
- Maintenance: Code maintenance and updates can be made easier with comments.
Php Comments Disadvantages:
- Increased file size: If comments are not managed properly, they can increase the size of the code file and slow down the website.
- Maintenance burden: It can be misleading and confusing if comments are not updated when code is changed.
- Over-commenting: It is difficult to quickly understand a code with too many comments.
- Security: Code that is publicly available may include sensitive information, such as database credentials or API keys, which may pose a security risk. Make sure any sensitive information is removed from the comments.
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