PHP: Difference between 2 dates in days

date-diff-in-days.php

<?php

/**
 * Date diff in days
 * The difference in days between 2 dates
 *
 * @param $from string Y-m-d date string
 * @param $to string Y-m-d date string
 */
function date_diff_in_days($from, $to) {

    // Setup date objects
    $now = new DateTime($from);
    $date = new DateTime($to);

    return $date->diff($now)->format('%d');

}