<?php function sysSubStr($string,$length,$append = false) {     if(strlen($string) <= $length )     {         return $string;     }     else     {         $i = 0;         while ($i < $length)         {             $stringTMP = substr($string,$i,1);             if ( ord($stringTMP) >=224 )             {                 $stringTMP = substr($string,$i,3);                 $i = $i + 3;             }             elseif( ord($stringTMP) >=192 )             {                 $stringTMP = substr($string,$i,2);                 $i = $i + 2;             }             else             {                 $i = $i + 1;             }             $stringLast[] = $stringTMP;         }         $stringLast = implode("",$stringLast);         if($append)         {             $stringLast .= "...";         }         return $stringLast;     } } $string = "简明现代魔法 —— 专注于互联网主流的各种技术"; $length = "27"; $append = true; echo sysSubStr($string,$length,$append); // 输出 // 简明现代魔法 —— 专... ?>

<?php //截取中文字符串 function mysubstr($str, $start, $len) {     $tmpstr = "";     $strlen = $start + $len;     for($i = 0; $i < $strlen; $i++) {         if(ord(substr($str, $i, 1)) > 0xa0) {             $tmpstr .= substr($str, $i, 2);             $i++;         } else             $tmpstr .= substr($str, $i, 1);     }     return $tmpstr; } ?>

<?php //截取utf8字符串 function utf8Substr($str, $from, $len) {     return preg_replace('#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$from.'}'.                        '((?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$len.'}).*#s',                        '$1',$str); } ?>

<?php /* Utf-8、gb2312都支持的汉字截取函数 cut_str(字符串, 截取长度, 开始长度, 编码); 编码默认为 utf-8 开始长度默认为 0 */ function cut_str($string, $sublen, $start = 0, $code = 'UTF-8') {     if($code == 'UTF-8')     {         $pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/";         preg_match_all($pa, $string, $t_string);         if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen))."...";         return join('', array_slice($t_string[0], $start, $sublen));     }     else     {         $start = $start*2;         $sublen = $sublen*2;         $strlen = strlen($string);         $tmpstr = '';         for($i=0; $i< $strlen; $i++)         {             if($i>=$start && $i< ($start+$sublen))             {                 if(ord(substr($string, $i, 1))>129)                 {                     $tmpstr.= substr($string, $i, 2);                 }                 else                 {                     $tmpstr.= substr($string, $i, 1);                 }             }             if(ord(substr($string, $i, 1))>129) $i++;         }         if(strlen($tmpstr)< $strlen ) $tmpstr.= "...";         return $tmpstr;     } } $str = "abcd需要截取的字符串"; echo cut_str($str, 8, 0, 'gb2312'); ?>