How can a beginner in PHP find and use pre-existing scripts or resources for displaying dynamic content on a website?

Beginners in PHP can find pre-existing scripts or resources for displaying dynamic content on websites by searching online repositories like GitHub, browsing PHP script websites, or joining PHP developer forums. Once a suitable script is found, it can be downloaded and included in the PHP file using the `include` or `require` functions. Beginners should also ensure that the script is compatible with their PHP version and properly configure any necessary settings before using it on their website.

<?php
// Include the pre-existing script for displaying dynamic content
require_once('path/to/script.php');

// Use the functions or classes from the script to display dynamic content
echo display_dynamic_content();
?>