phpthink中字符串截取代码-支持中文和其它编码

一款不错的支持中文和其它编码截取函数，不会出现乱码情况，有需要的朋友可以参考一下。

* 字符串截取，支持中文和其它编码
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 代码如下

代码如下

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/** ---------------------------------------------------------- * 字符串截取，支持中文和其它编码 ---------------------------------------------------------- * @param string $str 需要转换的字符串 * @param string $start 开始位置 * @param string $length 截取长度 * @param string $charset 编码格式 * @param string $suffix 截断显示字符 ---------------------------------------------------------- * @return string ---------------------------------------------------------- */ function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true) {     if(function_exists("mb_substr"))     $slice = mb_substr($str, $start, $length, $charset);     elseif(function_exists('iconv_substr')) {         $slice = iconv_substr($str,$start,$length,$charset);     }else{         $re['utf-8']   = "/[x01-x7f]|[xc2-xdf][x80-xbf]|[xe0-xef][x80-xbf]{2}|[xf0-xff][x80-xbf]{3}/";         $re['gb2312'] = "/[x01-x7f]|[xb0-xf7][xa0-xfe]/";         $re['gbk']      = "/[x01-x7f]|[x81-xfe][x40-xfe]/";         $re['big5']      = "/[x01-x7f]|[x81-xfe]([x40-x7e]|xa1-xfe])/";         preg_match_all($re[$charset], $str, $match);         $slice = join("",array_slice($match[0], $start, $length));     }     if($suffix && $str != $slice) return $slice."...";     return $slice; } /** ---------------------------------------------------------- * 字符串截取，支持中文和其它编码 ---------------------------------------------------------- * @param string $str 需要转换的字符串 * @param string $length 截取长度 * @param string $charset 编码格式 * @param string $suffix 截断显示字符 ---------------------------------------------------------- * @return string ---------------------------------------------------------- */ function mStr($str, $length, $charset="utf-8", $suffix=true){     return msubstr($str, 0, $length, $charset, $suffix); }

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/**
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* @param string $str 需要转换的字符串* @param string $start 开始位置

* @param string $length 截取长度

* @param string $charset 编码格式* @param string $suffix 截断显示字符 ----------------------------------------------------------* @return string ----------------------------------------------------------*/function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true) {    if(function_exists("mb_substr"))    $slice = mb_substr($str, $start, $length, $charset);    elseif(function_exists('iconv_substr')) {        $slice = iconv_substr($str,$start,$length,$charset);    }else{        $re['utf-8']   = "/[x01-x7f]|[xc2-xdf][x80-xbf]|[xe0-xef][x80-xbf]{2}|[xf0-xff][x80-xbf]{3}/";        $re['gb2312'] = "/[x01-x7f]|[xb0-xf7][xa0-xfe]/";        $re['gbk']      = "/[x01-x7f]|[x81-xfe][x40-xfe]/";        $re['big5']      = "/[x01-x7f]|[x81-xfe]([x40-x7e]|xa1-xfe])/";        preg_match_all($re[$charset], $str, $match);        $slice = join("",array_slice($match[0], $start, $length));    }    if($suffix && $str != $slice) return $slice."...";    return $slice;}/** ----------------------------------------------------------* 字符串截取，支持中文和其它编码 ----------------------------------------------------------* @param string $str 需要转换的字符串* @param string $length 截取长度* @param string $charset 编码格式* @param string $suffix 截断显示字符 ----------------------------------------------------------* @return string ----------------------------------------------------------*/function mStr($str, $length, $charset="utf-8", $suffix=true){    return msubstr($str, 0, $length, $charset, $suffix);}