函数

function weekStartEnd($year,$week=1) 
{
    $w = date('W');
    $diff = $w-$week;
    $weekday['start']=mktime(0,0,0,date('m'),date('d')-date('w')+1-$diff*7,date('Y'));  
    $weekday['end']=mktime(23,59,59,date('m'),date('d')-date('w')+7-$diff*7,date('Y'));

    return $weekday;
}