<?php

header("content-type:text/html;charset=gb2312");

// echo "aaaa";

//截取中文字符串

###  1. 截取GB2312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;

}

$con = "123电话巴萨的sasaS";

echo mysubstr($con,4,5);

?>

<?php

header("content-type:text/html;charset=utf-8");

//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);

}

$con = '123得到的ss第三32342代a12';

echo utf8Substr($con,2,8);

?>

<?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');

?>

< ?php

/**

* @package     BugFree

* @version     $Id: FunctionsMain.inc.php,v 1.32 2005/09/24 11:38:37 wwccss Exp $

*

*

* Return part of a string(Enhance the function substr())

*

* @author                  Chunsheng Wang <wwccss@263.net>

* @param string  $String  the string to cut.

* @param int     $Length  the length of returned string.

* @param booble  $Append  whether append "...": false|true

* @return string           the cutted string.

*/

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 = "17test.info 走在中国自动化测试的前沿";

$Length = "18";

$Append = false;

echo sysSubStr($String,$Length,$Append);

?>