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function MooCutstr($string, $length, $dot = " ...") {
 global $charset;

 if(strlen($string) <= $length) {
  return $string;
 }
 $string = str_replace(array("&", """, "<", ">"), array("&", """, "<", ">"), $string);
 $strcut = "";
 if(strtolower($charset) == "utf-8") {
  $n = $tn = $noc = 0;
  while($n < strlen($string)) {
   $t = ord($string[$n]);
   if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
    $tn = 1; $n++; $noc++;
   } elseif (194 <= $t && $t <= 223) {
    $tn = 2; $n += 2; $noc += 2;
   } elseif (224 <= $t && $t < 239) {
    $tn = 3; $n += 3; $noc += 2;
   } elseif (240 <= $t && $t <= 247) {
    $tn = 4; $n += 4; $noc += 2;
   } elseif (248 <= $t && $t <= 251) {
    $tn = 5; $n += 5; $noc += 2;
   } elseif ($t == 252 || $t == 253) {
    $tn = 6; $n += 6; $noc += 2;
   } else {
    $n++;
   }
   if($noc >= $length) {
    break;
   }
  }
  if($noc > $length) {
   $n -= $tn;
  }
  $strcut = substr($string, 0, $n);
 } else {
  for($i = 0; $i < $length; $i++) {
   $strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
  }
 }
 $strcut = str_replace(array("&", """, "<", ">"), array("&", """, "<", ">"), $strcut);

 return $strcut.$dot;
}

本文来源：http://www.gdgbn.com/kuzhan/19140/