PHP Comments and its use inside code

Use comments to explain intent

PHP supports // and # for single-line comments and /* ... */ for block comments. Comments should explain why code exists or clarify non-obvious behavior rather than repeat the code line by line.

<?php
// A single-line comment
$value = 10;
/* A block comment can span
   more than one line. */

 echo 'Hello world'; // this part is commented and not displayed
//echo 'This will not be displayed as commented';
#echo 'this is also commented';

Output is here

Hello world

Multiple Line comments

To comment more than one line or a block of code we can write like this

/* echo ' This is commented ';
echo 'This is also commented ';
echo 'this is also commented, so not displayed';
*/ 
echo 'this is displayed';

Output is here

this is displayed

In this type of code we must write a stop comment also like */ along with start comment like /*

We can comment to part of the line also.

<?php
$v1=3 + /*4 + */ 5;
echo $v1;
?>

Here output is 8 ( Not 12 as 4 is not added )

Comments are used in php to not to execute a part or a line of code. Use of comments is a good practice and it helps in code maintenance for future modification and updating. By using comments we can comment or stop executing on a part of a line or in a block of code.

You can read the HTML comments also. Here basic difference between html comment and php comment is in case of php comments; server never sends them to browser, where as all html comments are posted to browser but browser stops displaying them. Any one can see html comments by checking the view source of the page.
The comments are inserted in any part of the PHP code.

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