ThinkPHP封裝擷取字串函式網上看到好多種  記錄下

路徑檔案：Common/function.php

一、

/*字串截斷函式+省略號*/
function subtext($text, $length)
{
    if(mb_strlen($text, 'utf8') > $length) 
    return mb_substr($text, 0, $length, 'utf8').'...';
    return $text;
}

<volist name="list" id="vo">
{$vo.comment|subtext=40}
</volist>
 

二、

/**
 * 字串擷取，支援中文和其他編碼
 * @static
 * @access public
 * @param string $str 需要轉換的字串
 * @param string $start 開始位置
 * @param string $length 擷取長度
 * @param string $charset 編碼格式
 * @param string $suffix 截斷顯示字元
 * @return string
 */
function msubstr($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);
        if (false === $slice) {
            $slice = '';
        }
    } 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));
    }
    //字數不滿不新增...
    $count = mb_strlen($str, 'utf-8');
    if ($count > $length) {
        return $suffix ? $slice . '...' : $slice;
    } else {
        return $slice;
    }

}