公共方法

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/** *  utf-8中文截取，单字节截取模式 * * @access    public * @param     string  $str  需要截取的字符串 * @param     int  $slen  截取的长度 * @param     int  $startdd  开始标记处 * @return    string */

function cn_substr_utf8($str, $length, $start=0)    {        if(strlen($str) < $start+1)        {            return '';        }        preg_match_all("/./su", $str, $ar);        $str = '';        $tstr = '';        //为了兼容mysql4.1以下版本,与数据库varchar一致,这里使用按字节截取        for($i=0; isset($ar[0][$i]); $i++)        {            if(strlen($tstr) < $start)            {                $tstr .= $ar[0][$i];            }            else            {                if(strlen($str) < $length + strlen($ar[0][$i]) )                {                    $str .= $ar[0][$i];                }                else                {                    break;                }            }        }        return $str;    }

/** *获取昨天、上周、上月、等时间戳 * @param $time int -1:昨天 -7:上周 7:本周 -30:上个月 30:这个月 0:全部 * return array(); */function gettime($time){    switch($time){        case -1;            $time_s = mktime(0,0,0,date("m", strtotime("-1 day")), date("d",strtotime("-1 day")), date("Y",strtotime("-1 day")));            $time_e = mktime(23,59,59,date("m", strtotime("-1 day")), date("d",strtotime("-1 day")), date("Y",strtotime("-1 day")));            break;        case -7;            $time_s = mktime(0, 0 , 0,date("m"),date("d")-date("w")+1-7,date("Y"));            $time_e = mktime(23,59,59,date("m"),date("d")-date("w")+7-7,date("Y"));            break;        case -30;            $time_s = mktime(0, 0, 0, date('m')-1, 1, date('y'));            $time_e = mktime(23, 59, 59, date('m'), 0, date('y'));            break;        case -360;            $time_s = mktime(0, 0 , 0,1,1,date("Y")-1);            $time_e = mktime(23,59,59,12,31,date("Y")-1);            break;        case 7;            $time_s = mktime(0, 0 , 0,date("m"),date("d")-date("w")+1,date("Y"));            $time_e = mktime(23,59,59,date("m"),date("d")-date("w")+7,date("Y"));            break;        case 30;            $time_s = mktime(0, 0 , 0,date("m"),1,date("Y"));            $time_e = mktime(23,59,59,date("m"),date("t"),date("Y"));            break;        case 360;            $time_s = mktime(0, 0 , 0,1,1,date("Y"));            $time_e = mktime(23,59,59,12,31,date("Y"));            break;        default;            return 0;    }    return array($time_s,$time_e);}

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