PHP 截取中文字符串方法

PHP 截取中文字符串方法总结

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 />?>