date diff in PHP

/ this function is used to calculate date diff
 // PHP strtotime compatible strings
  function dateDiff($time1, $time2, $precision = 6) {
    // If not numeric then convert texts to unix timestamps
    if (!is_int($time1)) {
      $time1 = strtotime($time1);
    }
    if (!is_int($time2)) {
      $time2 = strtotime($time2);
    }

    // If time1 is bigger than time2
    // Then swap time1 and time2
    if ($time1 > $time2) {
      $ttime = $time1;
      $time1 = $time2;
      $time2 = $ttime;
    }

    // Set up intervals and diffs arrays
    $intervals = array('year','month','day','hour','minute','second');
    $diffs = array();

    // Loop thru all intervals
    foreach ($intervals as $interval) {
      // Create temp time from time1 and interval
      $ttime = strtotime('+1 ' . $interval, $time1);
      // Set initial values
      $add = 1;
      $looped = 0;
      // Loop until temp time is smaller than time2
      while ($time2 >= $ttime) {
        // Create new temp time from time1 and interval
        $add++;
        $ttime = strtotime("+" . $add . " " . $interval, $time1);
        $looped++;
      }
      $time1 = strtotime("+" . $looped . " " . $interval, $time1);
      $diffs[$interval] = $looped;
    }
   
    $count = 0;
    $times = array();
    // Loop thru all diffs
    foreach ($diffs as $interval => $value) {
      // Break if we have needed precission
      if ($count >= $precision) {
break;
      }
      // Add value and interval
      // if value is bigger than 0
      if ($value > 0) {
// Add s if value is not 1
if ($value != 1) {
  $interval .= "s";
}
// Add value and interval to times array
$times[] = $value . " " . $interval;
$count++;
      }
    }

    // Return string with times
    return implode(", ", $times);
  }
// PHP strtotime compatible strings
$arr_new = explode(",",$date_diff);
//print_r($arr_new);
$str =  $arr_new[0];
$months = substr($str,0,-6);

$str1 =  $arr_new[1];
$days = substr($str1,0,-5);

$str2 =  $arr_new[2];
$hours = substr($str2,0,-6);
$str3 =  $arr_new[3];
$minutes = substr($str3,0,-8);
    $str4 =  $arr_new[4];
$seconds = substr($str4,0,-8);