The commnet is the line/or group of lines in PHP script that will not executed .There are several way to write commnet.
PHP supports this type of commenting by using two consecutive forward slashes(//) pceceding any comment added.
block comments can start with a forward slash followed by an asterisk (/*), then close with an asterisk followed by a forward slash (*/)..
Example for PHP Comment
//This is Inline Comment
echo “Welcome to w3htmlschool.com”
/*This is Bloack comment
My First Progam