mySubstr

function mysubstr($string,$length,$dots=false,$wc_size=2) {
    $words = 0;
    $n = 0;
    if(strlen($string)<$length){
        return $string;
    }
    while ($n<strlen($string) && $words<$length ) {
        $t = ord($string[$n]);
        if($t==9 || $t==10 || (32<=$t && $t<=127)) {
            $n++;
            $words ++;
        } elseif(192<=$t && $t<=223) {
            $n += 2;
            if($wc_size == 1){
                $words += 1;
            }else{
                $words += 2;
            }
        } elseif(224<=$t && $t<=239) {
            $n += 3;
            if($wc_size == 1){
                $words += 1;
            }elseif($wc_size == 2){
                $words += 2;
            }else{
                $words += 3;
            }
        } else {
            $n++;
            $words ++;
        }
    }
    $wordscut = substr($string, 0, $n);
    if(strlen($wordscut)<strlen($string) && $dots){
        $wordscut .= '...';
    }
    return $wordscut;
}