String interception code in phpthink - supports Chinese and other encodings

String interception code in phpthink - supports Chinese and other encodings_PHP tutorial

WBOY

Release： 2016-07-13 16:54:56

Original

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A good interception function that supports Chinese and other encodings without garbled characters. Friends in need can refer to it.

代码如下

复制代码

/**
+----------------------------------------------------------
* 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);
}