define('CR', "\r");          // Carriage Return: Mac
define('LF', "\n");          // Line Feed: Unix
define('CRLF', "\r\n");      // Carriage Return and Line Feed: Windows
define('BR', '<br />' . LF); // HTML Break

function normalize($s) {
    // Normalize line endings using Global
    // Convert all line-endings to UNIX format
    $s = str_replace(CRLF, LF, $s);
    $s = str_replace(CR, LF, $s);
    // Don't allow out-of-control blank lines
    $s = preg_replace("/\n{2,}/", LF . LF, $s);
    return $s;
}

function normalize($s) {
    // Normalize line endings
    // Convert all line-endings to UNIX format
    $s = str_replace("\r\n", "\n", $s);
    $s = str_replace("\r", "\n", $s);
    // Don't allow out-of-control blank lines
    $s = preg_replace("/\n{2,}/", "\n\n", $s);
    return $s;
}