How to increase timestamp on clicking next and previous buttons

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I am new to PHP. I have written a code to increase and decrease month and year on clicking next and previous buttons but it does not work accordingly. Please help. Code is given below. you can run it in your localhost. Just click on next and previous button and observe the issue. If you don't understand, give a comment.

Code:

XML

<html>
<?php
error_reporting(0);
        $date=time();

        $day=date('d',$date); // current day in number.
        $month=date('m',$date); // current month in number.
        $year=date('Y',$date); // current year in number.

        $currentTimeStamp= strtotime("$year-$month-$day");
        $monthName  = date("F", $currentTimeStamp); // Get Current Month Name.
        $numDays = date("t",$currentTimeStamp); // Get how many days are there in the current month.
?>

<?php
        if(isset($_GET['p']))
        {

                $month=$month-1;
                $currentTimeStamp= strtotime("$year-$month-$day");
                $monthName  = date("F", $currentTimeStamp);
        }
        else if (isset($_GET['q']))
        {

                $month=$month+1;
                $currentTimeStamp= strtotime("$year-$month-$day");
                $monthName  = date("F", $currentTimeStamp);
        }
?>

    <table>
        <tr>
            <td>
                    <td>
                    <?php
                        echo "<a href='cal.php?p=$month'> << </a>
                        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;";
                    ?>
                    </td>

                    <th> <?php echo $monthName.", ".$year."  "; ?> </th>


                    <td colspan=5 align="left">
                    <?php
                        echo "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                        <a href='cal.php?q=$month'> >> </a>
                        ";
                    ?>
            </td>
        </tr>
    </table>

</html>

Posted 6-Oct-15 18:29pm

Member 11930850

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