What are the different ways to rename files in PHP?

To rename files in PHP, you can use the `rename()` function. This function takes two parameters: the current file name and the new file name. It can be used to rename files within the same directory or move them to a different directory. Additionally, you can check if the renaming operation was successful by checking the return value of the `rename()` function.

$oldFileName = 'old_file.txt';
$newFileName = 'new_file.txt';

if (rename($oldFileName, $newFileName)) {
    echo "File renamed successfully.";
} else {
    echo "Error renaming file.";
}