A PHP script is executed on the server, and the plain HTML result is sent back to the browser. Basic PHP Syntax A PHP script can be placed anywhere in the document. A PHP script starts with
<?php and ends with ? >
<?php
// PHP code goes here
? >
The default file extension for PHP files is ".php".
A PHP file normally contains HTML tags, and some PHP scripting code.
Below, we have an example of a simple PHP file, with a PHP script that uses a built-in PHP function "echo" to output the text "Hello World!" on a web page:
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<!DOCTYPE html>
<html>
<body>
<?php
echo
"Hello World";
?>
</body>
</html>