PHP Script can be placed any where in the document. and it start's with <?php and ends with ?>
<?php //php Code goes here ?>
By Default php file Extension is .php but you can also override the extension in your web server settings to your required extension.
PHP document contains html, Java-Script, Css or any other front end scripting language.
in below example we will use the php code in the body of html. echo is used to print data.
<!doctype html> <html> <head> PHP Hello World Example </head> <body> <?php echo 'Hello World'; ?> </body> </html>
Comment is very important ingredient in every programming language. PHP Provide Single line comments and also multi line comments option.
<!doctype html> <html> <head> PHP Hello World Example </head> <body> <?php //This is a single line comment. #This is another way of writing single line comment. /* *This is a *Multi line *Comment */ $value=10; //you can also comment like that. $total=$value/*here you can also place the comment*/+20; ?> </body> </html>