I am developing calendar in php.in this i created next and previous button ,but it is not working greate.I used get variable for Next and previous.but only previous button is only working.this is my code-
<? if (isset($_GET['nm']))
{
if($_GET['nm']==0)
{
$previous="pm=1";
$next="nm=1";
$month=0;
}
else {
$nm=$_get['nm']+1;
$pm=$_GET['nm']-1;
$previous="nm=".$pm;
$next="nm=".$nm;
$month=$_get['nm'];
}
}
if (isset($_GET['pm'])){
if($_GET['pm']==1)
{
$previous="pm=2";
$next="nm=0";
$month=-1;
}
else {
$nm=$_get['pm']-1;
$pm=$_GET['pm']+1;
$previous="pm=".$pm;
$next="pm=".$nm;
$month=-1*$_GET['pm'];
}
}
?>
<table>
<tr>
<td><a href="calendar.php?<? echo $previous;?>"><img src="images/previous.png"></img></a></td>
<td><? echo date('Y-m-d'); ?></td>
<td><a href="calendar.php?<? echo $next;?>"><img src="images/next.png"></img></a></td>
</tr>
</table>
please help me to make next and previous logic.