Determining whether a time period comprising a weekend

There are two known stamps. Determine whether to include Saturday and Sunday within the time stamp.

/**
* Determine whether the time period has weekend. Original, more please visit: www.ichasem.com
* @author winter
* @Version 2015 Nian 10 Yue 10 Ri 17:36:27
* @Param begin start time
* @Param last end time
*/

public function isWeek($begin,$last){
    $span = intval($last-$begin);
    if($span >= 604800){
        return 1;
    }else if($span > 0){
        $lWeek = date(‘w’,$last);
        $bWeek = date(‘w’,$begin);
        if($lWeek == 6 || $lWeek == 0 || $bWeek == 6 || $bWeek == 0){
            return 1;
        }else{
            if($bWeek > $lWeek){
                return 1;
            }else{
                return 0;
            }
        }
    }
}