PHP - 如果大於7天，將天數陣列轉換爲數週數組

Question

基本上，網站允許用戶選擇日期範圍，然後顯示從該範圍內拉取的數據。如果日期範圍爲7天或更短，則顯示每日信息，如果超過7天，則顯示每週信息。日期範圍是無限的（即，他們可以選擇74天，這應該返回10天7天，並且每週4天）。該數據被上拉爲：

[sales] => Array 
    (
     [2014-02-02] => Array 
      (
       [key1] => 1 
       [key2] => 2 
       [key3] => 3 
      ) 

     [2014-02-03] => Array 
      (
       [key1] => 4 
       [key2] => 5 
       [key3] => 6 
      ) 

     [2014-02-04] => Array 
      (
       [key1] => 7 
       [key2] => 8 
       [key3] => 9 
      ) 

     [2014-02-05] => Array 
      (
       [key1] => 9 
       [key2] => 8 
       [key3] => 7 
      ) 

     [2014-02-06] => Array 
      (
       [key1] => 6 
       [key2] => 5 
       [key3] => 4 
      ) 

     [2014-02-07] => Array 
      (
       [key1] => 3 
       [key2] => 2 
       [key3] => 1 
      ) 

     [2014-02-08] => Array 
      (
       [key1] => 1 
       [key2] => 2 
       [key3] => 3 
      ) 

     [2014-02-09] => Array 
      (
       [key1] => 4 
       [key2] => 5 
       [key3] => 6 
      ) 
    ) 

和需求（超過7天的範圍內組合成最後陣列的任何東西）轉換爲類似：

[sales] => Array 
    (
     [2014-02-02 - 2014-02-08] => Array 
      (
       [key1] => 31 
       [key2] => 32 
       [key3] => 33 
      ) 

     [2014-02-09 - 2014-02-09] => Array 
      (
       [key1] => 4 
       [key2] => 5 
       [key3] => 6 
      ) 
    ) 

編輯： 我明白，這會在某種循環，但無法找出邏輯來獲取鍵和值組合成組的7

if(count($array['sales']) > 7){ 
    //do something here 
} 

Answer 1

這是更好，當你使用Unix時間戳的日期。

if(($time1+(3600*24*7))>$time2) 
{ 
The difference is larger than 7 days 
}