Awesome Calendar

<?php
date_default_timezone_set("Europe/Sofia");

function draw_calendar($month, $year){
    $calendar = date('M', mktime(0, 0, 0, $month, 1, $year)) . '<br/>';
    //that string will contain the table and everything in it, we`ll add cells and rows to it
    $calendar .= '<table>';
    $counter = 1;
    //contans all headers that will be the same for every month
    $headers = array('Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat');
    //we have to add these headings to the table using concatenation
    $calendar .= '<tr class="table-row"><td class="table-cell">' . implode('</td><td class="table-cell">', $headers) . '</td></tr>';

    /* numeric representations of the days of the week */
    $days_of_the_week = date('w', mktime(0, 0, 0, $month, 1, $year));
    /* total days in a month - 28 to 31 */
    $days_in_month = date('t', mktime(0, 0, 0, $month, 1, $year));

    //let`s print blank cells until the first day of the week - today is thursday so from 0 to 3 it will print blank cells
    $calendar .= '<tr class="calendar-row">';

    for($i = 0; $i < $days_of_the_week ;$i++) {
        $calendar .= '<td class="empty-cells"> </td>';
    }

    //continue for the rest of the days
    for($i = $days_of_the_week; $i <= $days_in_month ;$i++) {
        $calendar .= '<td class="table-cells">';
        $calendar .= '<div class="table-cell-info">' . $counter . '</div>';
        $calendar .= '</td>';
        $counter++;

        if($days_of_the_week == 6) {
            $calendar .= '</tr>';
            $days_of_the_week = -1;
            if($counter != $days_in_month) {
                $i--;
            }

        }
        $days_of_the_week++;
    }

    return $calendar;
}

//echo date('t', mktime(0, 0, 0, 8, 1, 2014));
$inputYear = 2014;
//echo date('M', mktime(0, 0, 0, 1, 1, 2014));
for($i = 1; $i <= 12 ;$i++) {
    echo draw_calendar($i, $inputYear);
}

?>