Function to find all dates between two given dates

date_range.php

<?php

/**
 * function to calculate all dates between two dates
 *
 * @param date $first
 * @param date $last
 * @param string $step
 * @param string format
 *
 * @return array
 */
function dateRange( $first, $last, $step = '+1 day', $format = 'Y-m-d' )
{
    $dates = array();
    $current = strtotime($first);
    $last = strtotime($last);

    while( $current <= $last )
    {
    	$dates[] = date($format, $current);
        $current = strtotime($step, $current);
    }

    return $dates;
}