$vars['NAME OF PETITIONER'] = "Jon Doe";
$filename = "Petitiontoexpungeconviction.htm";
$handle = @fopen($filename, "r");

if ($handle) {
	$contents = fread($handle, filesize($filename));
	$user_script2 =  preg_replace('/\[([a-z]+)\]/ise', '(empty($vars[\\1]) ? "Unknown" : $vars[\\1])', $contents);
    fclose($handle);
}