<?php
## change to the previous month
if ($command == "prev_month") {
    if (--$month == 0) {
        $month = 12;
        $year--;
    }
}
## change to the next month
else if ($command == "next_month") {
    if (++$month == 13) {
        $month = 1;
        $year++;
    }
}

## if no month has been passed
if ($month == "") {
    $year = date("Y");
    $month = date("n");
    $month_name = date("F", mktime(0, 0, 0, $month, 1, $year));
}
## use current date if no month is passed
else {
    $year = date("Y", mktime(0, 0, 0, $month, 1, $year));
    $month = date("n", mktime(0, 0, 0, $month, 1, $year));
    $month_name = date("F", mktime(0, 0, 0, $month, 1, $year));
}


$dow = date("w", mktime(0, 0, 0, $month, 1, $year));  //which day 1 falls on in the week  (0 = Sun)
$dim = date("d", mktime(0, 0, 0, $month + 1, 0, $year)); //days in the current month
## modification to only print the number of weeks in a month
$wim = ceil(($dim + $dow) / 7); //weeks in month

$ct = 0;

echo "<br>
<table border='0' cellpadding='1' cellspacing='1' width='425' align='center'>
<tr>
  <td align='center'><h1><a href='index.php?
command=prev_month&month=$month&year=$year'><<</a> $month_name $year <a
href='index.php?command=next_month&month=$month&year=$year'>>></a></h1></td>
</tr>
</table>
<table border='1' cellpadding='1' cellspacing='1' width='425' align='center'>
<tr>
  <td  align='center'><b>Sun</td>
  <td  align='center'><b>Mon</td>
  <td  align='center'><b>Tue</td>
  <td  align='center'><b>Wed</td>
  <td  align='center'><b>Thu</td>
  <td  align='center'><b>Fri</td>
  <td  align='center'><b>Sat</td>
</tr>";

## print only the number of weeks needed
for ($row = 1; $row < $wim + 1; $row++) {
    echo "<tr height='60'>";

    ## prints week (Sun to Sat)
    for ($week = 1; $week < 8; $week++) {
        $ct++;
        $value = mktime(0, 0, 0, $month, $ct - $dow, $year);

        ## if $value is part of current month
        if (date("m", $value) == $month) {
            echo "<td align='center' class='body' width='85' valign='top'> <div align='right'><b>" . date("j", $value) . "</a></b></div><br> </td>";
        }
        ## print previous and next month dates, but grayed out
        else {
            echo "<td align='center' class='body' width='85' valign='top' bgcolor='#CCCCCC'><div align='right'><b>" . date("j", $value) . "</a></b></div><br></td>";
        }
    }

    echo "</tr>";
}

echo "</table>";

?>