Comments are the part of the PHP code , that is not executed. It’s a note note to the person who is reading the code.

• Let other programmers / developers understand what is written and what the code does .
• Comments can help you ! It will remind you what you’ve written if you you come back after several days or years.

1. Single line commnts

We can use // or # for single line comments and /* */ for block comments. Look at the example below.

<?php
# example of single line comment
echo "Hello world"; // this is also single line comment
/*
This is an
example of
multi-line comment
*/
?>


See the output below. Comments have no effect in the output.

Output:

Hello world


But do not try to nest comments.

<?php
/* this is
commented */ but this don't */
?>