PHP script starts with <?php and ends with ?> and statements end with a semicolon (;). PHP file normally contains HTML tags, and some PHP scripting code. PHP script that uses a built-in PHP function "echo" to output the text. PHP, keywords (e.g. if, else, while, echo, etc.), classes, functions, and user-defined functions are not case-sensitive.
Example
<!DOCTYPE html>
<html>
<body>
<h1>My first PHP page</h1>
<?php
echo "Hello World!";
?>
</body>
</html>
