function countdays($d)
{
 $olddate = substr($d, 4);
 $newdate = date(Y) ."".$olddate;
 $nextyear = date(Y)+1 ."".$olddate;
  if($newdate > date("Y-m-d"))
  {
  $start_ts = strtotime($newdate);
  $end_ts = strtotime(date("Y-m-d"));
  $diff = $end_ts - $start_ts;
  $n = round($diff / 86400);
  $return = substr($n, 1);
  return $return;
  }
  else
  {
  $start_ts = strtotime($nextyear);
  $end_ts = strtotime(date("Y-m-d"));
  $diff = $end_ts - $start_ts;
  $n = round($diff / 86400);
  $return = substr($n, 1);
  return $return;
  }
}

<?PHP
$Date_1=date("Y-m-d");
$Date_2="$daoqiriqi";
$d1=strtotime($Date_1);
$d2=strtotime($Date_2);
$Days=round(($d1-$d2)/3600/24);
echo ".$Days."";
?>

相差{$Days=round((strtotime(date("Y-m-d"))-strtotime($daoqiriqi))/3600/24);}天

相差{$date=floor((strtotime($daoqiriqi)-strtotime(date("Y-m-d")))/86400);}天