<?php
//php simple calendar, by rinaldo.id
//created 11/20/2017

if (isset($_GET['month']))
    $month = $_GET['month'];
else
    $month = date("m");

if (isset($_GET['year']))
    $year = $_GET['year'];
else
    $year = date("Y");


?>

<table border="1">
<tr>
    <th>Sun</th>
    <th>Mon</th>
    <th>Tue</th>
    <th>Wed</th>
    <th>Thu</th>
    <th>Fri</th>
    <th>Sat</th>
</tr>

<?php
$lastmonth = $month - 1;
if ($lastmonth == 0)
{
    $lastmonth=12;
    $year2 = $year-1;
}
else
{
    $year2 = $year;
}

$count_days_month = cal_days_in_month(CAL_GREGORIAN, $month, $year);
$count_days_lastmonth = cal_days_in_month(CAL_GREGORIAN, $lastmonth, $year2);

$dayname = jddayofweek(gregoriantojd($month,1,$year),0);
if ($dayname != 0)
{
    $startcal = $count_days_lastmonth - $dayname +1;

}
else
{
    $startcal = 1;
}

$counter = 0;

if ($startcal !=1)
{
    for ($loop = $startcal;  $loop <= $count_days_lastmonth; $loop++)
    {
        $counter++;
        if ($counter ==1)
        {
            echo "<tr>";
        }
        echo "<td><i>".$loop."</i></td>";
        if ($counter %7 ==0)
        {
            echo "</tr>";
            $counter =0;
        }
    }
}
    for ($loop = 1;  $loop <= $count_days_month; $loop++)
    {
        $counter++;
        if ($counter ==1)
        {
            echo "<tr>";
        }
        echo "<td><b>".$loop."</b></td>";
        if ($counter %7 ==0)
        {
            echo "</tr>";
            $counter =0;
        }
    }
    $nextmonth_date = 1;
    if ($counter !=0)
    {
        for ($counter; $counter <7; $counter++)
        {
            echo "<td><i>".$nextmonth_date."</i></td>";
            if ($nextmonth_date %7 ==0)
            {
                echo "<hr>";
            }
            $nextmonth_date++;

        }
    }


?>

</table>