How can the issue of including files multiple times be resolved in PHP scripts to avoid conflicts?

When including files multiple times in PHP scripts, conflicts can arise due to redeclaring functions or classes. To avoid this, you can use the `require_once` or `include_once` functions instead of `require` or `include`. These functions ensure that the file is only included once, preventing conflicts.

// Example of including a file using require_once
require_once 'myfile.php';