How does the usage of GLOB_BRACE in the code snippet provided impact the functionality of the PHP script, and what are the potential pitfalls associated with it?

Using GLOB_BRACE in the code snippet provided allows for pattern matching in the glob() function, which simplifies the process of retrieving files matching specific criteria. However, a potential pitfall is that if the pattern is not properly constructed, it could result in unexpected file selections or errors. It is important to carefully construct the pattern to ensure the desired files are selected.

// Fix for using GLOB_BRACE in the glob() function
$files = glob("{folder1/*.txt,folder2/*.txt}", GLOB_BRACE);

foreach ($files as $file) {
    echo $file . "\n";
}