Date Difference in PHP

The date format shud be in mm/dd/yyyy

function dateDiff($dformat, $endDate, $beginDate){$date_parts1=explode($dformat, $beginDate);$date_parts2=explode($dformat, $endDate);$start_date=gregoriantojd($date_parts1[0], $date_parts1[1], $date_parts1[2]);$end_date=gregoriantojd($date_parts2[0], $date_parts2[1], $date_parts2[2]);return $end_date - $start_date;}