Include a Class from another file in PHP

To include a class in PHP, we can use any of the include/include_once or require/require_once methods. In this example, we will create the function in function.php file and then import it in index.php file.

Content of function.php:

<?php
class myNewClass {
	<!-- Function Goes Here -- >
}
?>

Content of Index.php:

<?php
require('function.php');
$vars = new myNewClass();
?>

Here, when a user visits index.php, upon initialization, function.php is called (due to require) and then treated as a part of index.php. Now, index.php can call functions from function.php as well.