PHP For the Absolute Beginner: First PHP page

As you can see above, all PHP code needs to be inside opening and closing PHP tags <?php and ?>

We can write document that contain only php code or we can insert php code inside HTML document like this:

<html>

      <head>

          <title>My First PHP page</title>

      </head>

<body>

<?php print ('Hello World!') ; ?>

   </body>

</html>

Comments in PHP:
PHP supports 'C', 'C++' and Unix shell-style (Perl style) comments. For example:

<?php echo 'This is a test'; // This is a one-line c++ style comment /* This is a multi line comment yet another line of comment */ echo 'This is yet another test'; echo 'One Final Test'; # This is a one-line shell-style comment?>

Php is not case sensitive.However all variables are case-sensitive in PHP:

For example if echo is same as ECHO, but $VARIABLE is not the same as $variable.