PHP Comments

PHP comments are used to give a brief description about any specific line of code or about a module in the code to make the code more user-friendly.

PHP Comments can be of two types:

Single line Comments
Multi line Comments

Single Line Comments:

Single line comments can be used in two manners, either like C++ style single line comment (using // before the comment line) or Unix Shell style single line comment (using # before the comment line).

Multi Line Comments:

Multi line comments can be used for commenting a part of the code or to write a multiple lines description about the code. The lines enclosed between /* */ are considered as multi line comments.

Example 1: Representing Single Line Comments

<!DOCTYPE html>
<html>
<body>
 
<?php
$txt1 = "Sum of 1234 and 4321 is:";
$txt2 = “Difference of 1234 and 4321 is:";
 
$x = 1234;
$y = 4321;
 
// Sum of two numbers
echo "<h3>" . $txt1 . "</h3>";
echo $x + $y;
 
# Difference of two numbers
echo "<h3>" . $txt2 . "</h3>";
echo $x - $y;
 
?>
 
</body>
</html>

Example 2: Representing Multi Line Comments
Program of Sum and Difference of two variables in PHP

<!DOCTYPE html>
<html>
<body>
 
<?php
$txt1 = "Sum of 1234 and 4321 is:";
$txt2 = “Difference of 1234 and 4321 is:";
$x = 1234;
$y = 4321;
 
echo "<h3>" . $txt1 . "</h3>";
echo $x + $y;
 
echo "<h3>" . $txt2 . "</h3>";
echo $x - $y;
 
?>
 
</body>
</html>

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