Calendar in PHP

cal.php

<?php

function year2array ($year)
{
    $res = $year >= 1970;
    if ($res)
    {
        // this line gets and sets same timezone, don't ask why :)
        date_default_timezone_set ( date_default_timezone_get () );
        
        $dt = strtotime ( "-1 day", strtotime ( "$year-01-01 00:00:00" ) );
        $res = array ();
        $week = array_fill ( 1, 7, false );
        $last_month = 1;
        $w = 1;
        do {
            $dt = strtotime ( '+1 day', $dt );
            $dta = getdate ( $dt );
            $wday = $dta ['wday'] == 0 ? 7 : $dta ['wday'];
            if (($dta ['mon'] != $last_month) || ($wday == 1))
            {
                if ($week [1] || $week [7])
                    $res [$last_month] [] = $week;
                $week = array_fill ( 1, 7, false );
                $last_month = $dta ['mon'];
            }
            $week [$wday] = $dta ['mday'];
        } while ( $dta ['year'] == $year );
    }
    return $res;
}

function month2table($month, $calendar_array)
{
    $ca = 'align="center"';
    $res = "<table cellpadding=\"2\" cellspacing=\"1\" style=\"border:solid 1px #000000;font-family:tahoma;font-size:12px;background-color:#ababab\"><tr><td $ca>সোম</td><td $ca>মঙ্গল</td><td $ca>বুধ</td><td $ca>বৃহস্পতি</td><td $ca>শুক্র</td><td $ca>শনি</td><td $ca>রবি</td></tr>";
    foreach ( $calendar_array [$month] as $month => $week )
    {
        $res .= '<tr>';
        foreach ( $week as $day )
        {
            $res .= '<td align="right" width="20" bgcolor="#ffffff">' . ($day ? $day : '&nbsp;') . '</td>';
        }
        $res .= '</tr>';
    }
    $res .= '</table>';
    return $res;
}

$calarr = year2array ( 2014 );
echo month2table ( 10, $calarr ); // January