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Hello World
Write a file called hello_world.php and open it in your browser
(Files including PHP code must end with extensions .php or .phtml
to be recognized form the web server):
<![CDATA[
<html>
<body>
<h3>This is the PHP script:</h3>
<?php
echo 'Hello World! <p>';
?>
This is again HTML ...
</body>
</html>
]]>
How does the HTTP-Server process HTML and PHP together?
The web server will read the HTML file from top to bottom, and when ever
it comes across PHP script (identified by an opening <?php and a
closing ?> it will send it off to the PHP engine to be interpreted
and converted into HTML. The output of the PHP
interpreter will be inserted into the HTML stream
generated by the server from the HTML page.
It is this stream that will be sent to the client resulting in a display.