function getweekandmonth($expected){
$expected1 = $expected; //$expected为孕产期，时间戳格式
$expected2 = strtotime(date('Y-m-d')); //$expected2 为现在的时间
$day=($expected1-$expected2)/(3600*24);
$week= (int)(40-($day/7));
if(abs($day%7)==0){
$day=0;
}else{
$day= 7-abs($day%7);
}
$month=ceil($week/4);
return array('week'=>"$week",'month'=>"$month",'day'=>"$day");
}