How do I do a strtr on UTF-8 in PHP?

Question

I'm looking for a UTF-8 compatible strtr for PHP.

Answer 1

function strtr_utf8($str, $from, $to) {
    $keys = array();
    $values = array();
    preg_match_all('/./u', $from, $keys);
    preg_match_all('/./u', $to, $values);
    $mapping = array_combine($keys[0], $values[0]);
    return strtr($str, $mapping);
}

Answer 2

function strtr_utf8($string, $from, $to)
{
    $string = utf8_decode($string);    
    $string = strtr($string, utf8_decode($from), $to);

    return utf8_encode($string);
}