/** *  * 中英混合字符串長度判斷  * @param unknown_type $str * @param unknown_type $charset */function strLength($str, $charset = 'utf-8') {  if ($charset == 'utf-8')    $str = iconv ( 'utf-8', 'gb2312', $str );  $num = strlen ( $str );  $cnNum = 0;  for($i = 0; $i < $num; $i ++) {    if (ord ( substr ( $str, $i + 1, 1 ) ) > 127) {      $cnNum ++;      $i ++;    }  }  $enNum = $num - ($cnNum * 2);  $number = ($enNum / 2) + $cnNum;  return ceil ( $number );}

/** *  * 中英混合的字符串截取 * @param unknown_type $sourcestr * @param unknown_type $cutlength */function cut_str($sourcestr, $cutlength) {  $returnstr = '';  $i = 0;  $n = 0;  $str_length = strlen ( $sourcestr ); //字符串的字節數   while ( ($n < $cutlength) and ($i <= $str_length) ) {    $temp_str = substr ( $sourcestr, $i, 1 );    $ascnum = Ord ( $temp_str ); //得到字符串中第$i位字符的ascii碼     if ($ascnum >= 224) //如果ASCII位高與224，    {      $returnstr = $returnstr . substr ( $sourcestr, $i, 3 ); //根據UTF-8編碼規范，將3個連續的字符計為單個字符         $i = $i + 3; //實際Byte計為3      $n ++; //字串長度計1    } elseif ($ascnum >= 192) //如果ASCII位高與192，    {      $returnstr = $returnstr . substr ( $sourcestr, $i, 2 ); //根據UTF-8編碼規范，將2個連續的字符計為單個字符       $i = $i + 2; //實際Byte計為2      $n ++; //字串長度計1    } elseif ($ascnum >= 65 && $ascnum <= 90) //如果是大寫字母，    {      $returnstr = $returnstr . substr ( $sourcestr, $i, 1 );      $i = $i + 1; //實際的Byte數仍計1個      $n ++; //但考慮整體美觀，大寫字母計成一個高位字符    } else //其他情況下，包括小寫字母和半角標點符號，    {      $returnstr = $returnstr . substr ( $sourcestr, $i, 1 );      $i = $i + 1; //實際的Byte數計1個      $n = $n + 0.5; //小寫字母和半角標點等與半個高位字符寬...    }  }  if ($str_length > $cutlength) {    $returnstr = $returnstr . "..."; //超過長度時在尾處加上省略號  }  return $returnstr;}