異なる文字エンコーディングの文字列から印刷不可能な文字を効果的に削除するにはどうすればよいですか?

$string = preg_replace('/[\x00-\x1F\x7F-\xFF]/', '', $string);

$string = preg_replace('/[\x00-\x1F\x7F]/', '', $string);

$string = preg_replace('/[\x00-\x1F\x7F\xA0]/u', '', $string);

// Create an array of non-printable characters
$badchars = array(
    // Control characters
    chr(0), chr(1), chr(2), chr(3), chr(4), chr(5), chr(6), chr(7), chr(8),
    chr(9), chr(10), chr(11), chr(12), chr(13), chr(14), chr(15), chr(16),
    chr(17), chr(18), chr(19), chr(20), chr(21), chr(22), chr(23), chr(24),
    chr(25), chr(26), chr(27), chr(28), chr(29), chr(30), chr(31),
    // Non-printable characters
    chr(127)
);

// Replace the bad characters
$str2 = str_replace($badchars, '', $str);