PHP中如何计算一年过了多少天，还剩多少天

 1 $year = 2014;
 2         $month = 4;
 3         $day = 22;
 4         $month_day = 0;
 5         $total = 0;
 6         $temp = 0;
 7         $isRN = false;
 8         if($year % 4 == 0 && $year %100 != 0 || $year % 400 == 0){
 9             $isRN = true;
10         }
11         for($i = 1;$i <= $month;$i++){
12             switch($i){
13                 case 1:
14                 case 3:
15                 case 5:
16                 case 7:
17                 case 8:
18                 case 10:
19                 case 12:
20                     $month_day = 31;
21                     break;
22                 case 2:
23                     if($isRN){
24                         $month_day = 29;
25                     }else{
26                         $month_day = 28;
27                     }
28                     break;
29                 default:
30                     $month_day = 30;
31                     break;
32 
33             }
34             if($i < $month){
35                 $total += $month_day;
36             }
37         }
38         //还剩多少天
39         for($i = $month;$i <= 12;$i++){
40             switch($i){
41                 case 1:
42                 case 3:
43                 case 5:
44                 case 7:
45                 case 8:
46                 case 10:
47                 case 12:
48                     $month_day = 31;
49                     break;
50                 case 2:
51                     if($isRN){
52                         $month_day = 29;
53                     }else{
54                         $month_day = 28;
55                     }
56                     break;
57                 default:
58                     $month_day = 30;
59                     break;
60 
61             }
62 
63                 $temp += $month_day;
64 
65         }
66         $total = $total + $day;
67         echo $year."年过了".$total."天!<br/>";
68         $temp = $temp-$day;
69         echo "离2015年还有".$temp."天！";