Functions are similar to variables in the sense that they hold information within them and can be executed once or unlimited times by a PHP script. PHP has many functions already created with a specific job or function a pre installed function we have alreay worked with in this tutorial is echo(). You can create your own function too.
Using a feature that PHP offers, use we are allowed to do these server side includes to include both HTML and PHP pages, and actually any pages we really want to. Including HTML pages becomes very useful, in creating the same look and feel over your entire site, as we can include a standard header and footer on every page.
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