phpcms v9 更改系统函数str_cut

function str_cut($string, $length, $dot = '')
{
 $strlen = strlen($string);
 if($strlen <= $length) return $string;
 $string = str_replace(array(' ', '&', '"', ''', '“', '”', '—', '<', '>', '·', '…'), array(' ', '&', '"', "'", '“', '”', '—', '<', '>', '·', '…'), $string);
 $strcut = '';
 if(strtolower(CHARSET) == 'utf-8')
 {
  $n = $tn = $noc = 0;
  while($n < $strlen)
  {
   $t = ord($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
 {
  $dotlen = strlen($dot);
  $maxi = $length – $dotlen – 1;
  for($i = 0; $i < $maxi; $i++)
  {
   $strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
  }  //Cuoxin.com
 }
 $strcut = str_replace(array('&', '"', "'", '<', '>'), array('&', '"', ''', '<', '>'), $strcut);
 return $strcut.$dot;
}