Create Function for Difference Between Two Dates Using PHP

Use this Code Create Function for Difference Between Two Dates Using PHP:

// difference between two dates
function diffTwoDate($date1, $date2){
    $start_date = strtotime($date1);
    $end_date = strtotime($date2);
    return ($end_date - $start_date)/60/60/24;
}

Call Function:

diffTwoDate('2012-12-12', '2012-12-20');