Get average interval between two dates PHP

问题:

So I have the following array ($lifeSpanArray) and I'm looking to calculate the average interval between the two dates.

What I have so far, but I think I'm thinking slightly wrong with it:

<?php     foreach ($lifeSpanArray as $key) {          $newTimeAdd = new DateTime($key["timeAdded"]);         $newTimeRead = new DateTime($key["timeRead"]);          $interval = $newTimeAdd->diff($newTimeRead);         var_dump($interval);     } ?> 

Which outputs:

Array (     [0] => Array     (         [timeAdded] => 07/15/2014         [timeRead] => 07/15/2014     )     [1] => Array     (         [timeAdded] => 07/14/2014         [timeRead] => 07/14/2014     )     [2] => Array     (         [timeAdded] => 07/13/2014         [timeRead] => 07/15/2014     )      [3] => Array     (         [timeAdded] => 07/13/2014         [timeRead] => 07/13/2014     )      [4] => Array     (         [timeAdded] => 07/12/2014         [timeRead] => 07/12/2014     )      [5] => Array     (         [timeAdded] => 07/12/2014         [timeRead] => 07/12/2014     )      [6] => Array     (         [timeAdded] => 07/12/2014         [timeRead] => 07/12/2014     )      [7] => Array     (         [timeAdded] => 07/12/2014         [timeRead] => 07/12/2014     )      [8] => Array     (         [timeAdded] => 07/12/2014         [timeRead] => 07/12/2014     )      [9] => Array     (         [timeAdded] => 07/11/2014         [timeRead] => 07/11/2014     )      [10] => Array     (         [timeAdded] => 07/11/2014         [timeRead] => 07/11/2014     )      [11] => Array     (         [timeAdded] => 07/10/2014         [timeRead] => 07/11/2014     )      [12] => Array     (         [timeAdded] => 07/10/2014         [timeRead] => 07/10/2014     ) ) 

回答1:

Try the following:

 <?php         $intervals = array();         foreach ($lifeSpanArray as $key) {              $newTimeAdd = new DateTime($key["timeAdded"]);             $newTimeRead = new DateTime($key["timeRead"]);             $interval = $newTimeAdd->diff($newTimeRead);             $intervals[] = $interval->days;//get days         }         if(!empty($intervals))         {             $average = average($intervals);         }       function average($arr)     {        return array_sum($arr)/count($arr);     }  ?> 

回答2:

Your solution is correct but do not forger to call the format() method on the returned object from diff.

Example from PHP.net :

<?php $datetime1 = new DateTime('2009-10-11'); $datetime2 = new DateTime('2009-10-13'); $interval = $datetime1->diff($datetime2); echo $interval->format('%R%a days'); ?> 

文章来源: Get average interval between two dates PHP