What alternative methods can be used in PHP to write content to a file without encountering issues with newline characters?

When writing content to a file in PHP, issues with newline characters can arise when using functions like `file_put_contents()` or `fwrite()`. To avoid problems with newline characters, you can use the `PHP_EOL` constant, which represents the correct newline character for the current platform. By using `PHP_EOL` instead of manually inserting newline characters, your code will be more platform-independent and less prone to issues.

$content = "This is a line of text." . PHP_EOL;
file_put_contents('file.txt', $content, FILE_APPEND);