php截取中文函数

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[php] view plaincopyprint?<?php  //截取中文字符函数一  function cutstr($string, $length, $dot = ' ...' ,$charset = 'utf-8') {      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;  }  ?>

原文地址;http://blog.csdn.net/zhaoxuejie/article/details/7474229

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