How can PHP developers ensure that files are successfully copied multiple times without encountering errors or unexpected behavior?

When copying files multiple times in PHP, developers should ensure that they handle any errors that may occur during the process. This can be done by using error handling techniques such as try-catch blocks to catch any exceptions that may be thrown. Additionally, developers should check for the existence of the source and destination files before attempting to copy them to avoid unexpected behavior.

try {
    $sourceFile = 'source.txt';
    $destinationFile = 'destination.txt';
    
    if (file_exists($sourceFile) && !file_exists($destinationFile)) {
        copy($sourceFile, $destinationFile);
        echo 'File copied successfully.';
    } else {
        echo 'Source file does not exist or destination file already exists.';
    }
} catch (Exception $e) {
    echo 'An error occurred: ' . $e->getMessage();
}