Are there any best practices for including files in PHP loops to avoid conflicts?

When including files within PHP loops, it is important to ensure that the included files do not conflict with each other or cause unexpected behavior. One way to avoid conflicts is to use the `require_once` or `include_once` functions instead of `require` or `include`, which will prevent the same file from being included multiple times. This ensures that the code within the included file is only executed once, even if the loop runs multiple times.

for ($i = 0; $i < 5; $i++) {
    include_once 'file.php';
}