In this article, you will learn how to include PHP scripts from external files. The PHP include_once keyword is used to embed PHP script from an external PHP file.
If the file does not exist, it will show a warning however, the program will execute successfully.
If the file is already included, this statement will be ignored.
examples of the INCLUDE_ONCE keyword
Example 1. In this example, we use include_once to add a footer to a page.
<!DOCTYPE html>
<html>
<body>
<h1>Welcome to my home page!</h1>
<p>Some text.</p>
<p>Some more text.</p>
<?php include_once 'footer.php';?>
</body>
</html>
