php截取一定長度的字串

function ssubstr($string, $length, $dot = ' ...') {  global $charset;   if(strlen($string) <= $length) {    return $string;   }   $string = str_replace(array('&amp;', '&quot;', '&lt;', '&gt;'), 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('&amp;', '&quot;', '&lt;', '&gt;'), $strcut);  return $strcut.$dot; }   截取一定長度的字串（該函數對gb2312使用有效）  <?  function wordscut($string, $length ,$sss=0) { if(strlen($string) > $length) {                 if($sss){  $length=$length - 3;  $addstr=@# ...@#; }    for($i = 0; $i < $length; $i++) {     if(ord($string[$i]) > 127) {  $wordscut .= $string[$i].$string[$i + 1]; //  $i++; //開源軟體:phpfensi.com    } else {  $wordscut .= $string[$i];     }    }    return $wordscut.$addstr;  }  return $string;  }  ?>

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