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How can include files be managed effectively to prevent conflicts and errors in PHP scripts?

To manage include files effectively and prevent conflicts and errors in PHP scripts, it is important to use proper file paths, avoid including the same file multiple times, and organize your includes in a logical manner. Additionally, using functions like `require_once` instead of `require` can help prevent including the same file more than once.

php 
// Example of managing include files effectively
require_once 'config.php'; // Include configuration file
require_once 'functions.php'; // Include functions file
require_once 'header.php'; // Include header file

// Your PHP script code goes here

require_once 'footer.php'; // Include footer file

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