php - calculate average interval on array of dates -

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i have array dates

array (     [0] => 2014-09-05     [1] => 2014-09-09     [2] => 2014-09-09     [3] => 2014-09-11     [4] => 2014-09-16     [5] => 2014-09-18     [6] => 2014-09-25 )

look interval between dates approximately 3 days.

how can calculate interval automatically?

this should work you:

just loop through of dates , check if there still next date. if yes subtract both timestamps , add $intervals array.

at end take average of intervals, in seconds, can divide 3600 * 24 average day interval.

<?php      $dates = [         "2014-09-05",         "2014-09-09",         "2014-09-09",         "2014-09-11",         "2014-09-16",         "2014-09-18",         "2014-09-25",         ];      foreach($dates $key => $date) {         if(isset($dates[($key+1)]))             $intervals[] = abs(strtotime($date) - strtotime($dates[($key+1)]));     }      $average = array_sum($intervals) / count($intervals);     echo $average / (3600 * 24);  ?>

output:

   _ 3.33  //if want can round

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