PHP截取中文字符串方法

1. 截取GB2312中文字符串

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

2. 截取utf8编码的多字节字符串

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

3. UTF-8、GB2312都支持的汉字截取函数

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

4. BugFree 的字符截取函数

< ?php <br>/** <br> * @package     BugFree <br> * @version     $Id: FunctionsMain.inc.php,v 1.32 2005/09/24 11:38:37 wwccss Exp $ <br> * <br> * <br> * Return part of a string(Enhance the function substr()) <br> * <br> * @author                  Chunsheng Wang <wwccss@263.net> <br> * @param string  $String  the string to cut. <br> * @param int     $Length  the length of returned string. <br> * @param booble  $Append  whether append "...": false|true <br> * @return string           the cutted string. <br> */ <br>function sysSubStr($String,$Length,$Append = false) <br>{ <br>    if (strlen($String) < = $Length ) <br>    { <br>        return $String; <br>    } <br>    else <br>    { <br>        $I = 0; <br>        while ($I < $Length) <br>        { <br>            $StringTMP = substr($String,$I,1); <br>            if ( ord($StringTMP) >=224 ) <br>            { <br>                $StringTMP = substr($String,$I,3); <br>                $I = $I + 3; <br>            } <br>            elseif( ord($StringTMP) >=192 ) <br>            { <br>                $StringTMP = substr($String,$I,2); <br>                $I = $I + 2; <br>            } <br>            else <br>            { <br>                $I = $I + 1; <br>            } <br>            $StringLast[] = $StringTMP; <br>        } <br>        $StringLast = implode("",$StringLast); <br>        if($Append) <br>        { <br>            $StringLast .= "..."; <br>        } <br>        return $StringLast; <br>    } <br>} <br> <br>$String = "CodeBit.cn -- 简单、精彩、通用"; <br>$Length = "18"; <br>$Append = false; <br>echo sysSubStr($String,$Length,$Append); <br>?></wwccss@263.net>