PHP include_once Keyword

PHP instanceof Keyword
PHP include Keyword

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>

<h1>Welcome to my home page!</h1>
<p>Some text.</p>
<p>Some more text.</p>
<?php include_once 'footer.php';?>

PHP instanceof Keyword
PHP include Keyword
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