calander code semi working

[blueman378]

hi guys well ive got a calender code im modifying to add a next month/previous feature,

so heres the code

<?php
$next = $_GET["next"];
$back = $_GET["back"];
$max = "12";
$min = "1";
    // get this month and this years as an int
    	if (isset($next)) {
	$next++;
    $thismonth = $next;
} elseif (isset($back)) {
    $back--;
    $thismonth = $back;
} else {
    $thismonth = ( int ) date( "m" );
}
    $thisyear = date( "Y" );
    
    // find out the number of days in the month
    $numdaysinmonth = cal_days_in_month( CAL_GREGORIAN, $thismonth, $thisyear );
    
    // create a calendar object
    $jd = cal_to_jd( CAL_GREGORIAN, date( "m" ),date( 1 ), date( "Y" ) );
    
    // get the start day as an int (0 = Sunday, 1 = Monday, etc)
    $startday = jddayofweek( $jd , 0 );
    
    // get the month as a name
    // $monthname = jdmonthname( $jd, 1 )
if ($thismonth == "1") {
    $monthname = "January";
} elseif ($thismonth == "2") {
    $monthname = "February";
}
elseif ($thismonth == "3") {
    $monthname = "March";
}
elseif ($thismonth == "4") {
    $monthname = "April";
}
elseif ($thismonth == "5") {
    $monthname = "May";
}
elseif ($thismonth == "6") {
    $monthname = "June";
}
elseif ($thismonth == "7") {
    $monthname = "July";
}
elseif ($thismonth == "8") {
    $monthname = "August";
}
elseif ($thismonth == "9") {
    $monthname = "September";
}
elseif ($thismonth == "10") {
    $monthname = "October";
}
elseif ($thismonth == "11") {
    $monthname = "November";
}
elseif ($thismonth == "12") {
    $monthname = "December";
}
else {
    echo "Unknown month";
}
?>
<table>
    <tr>
        <td colspan="7"><div align="center"><strong><?= $monthname ?></strong></div></td>
    </tr>
    <tr>
        <td><strong>S</strong></td>
        <td><strong>M</strong></td>
        <td><strong>T</strong></td>
        <td><strong>W</strong></td>
        <td><strong>T</strong></td>
        <td><strong>F</strong></td>
        <td><strong>S</strong></td>
    </tr>
    <tr>
<?php

    // put render empty cells

    $emptycells = 0;

    for( $counter = 0; $counter <  $startday; $counter ++ ) {
    
        echo "\t\t<td>-</td>\n";
        $emptycells ++;
    
    }
    
    // renders the days
    
    $rowcounter = $emptycells;
    $numinrow = 7;
    
    for( $counter = 1; $counter <= $numdaysinmonth; $counter ++ ) {
    
        $rowcounter ++;
        
        echo "\t\t<td>$counter</td>\n";
        
        if( $rowcounter % $numinrow == 0 ) {
        
            echo "\t</tr>\n";
            
            if( $counter < $numdaysinmonth ) {
            
                echo "\t<tr>\n";
            
            }
        
            $rowcounter = 0;
        
        }
    
    }
    
    // clean up
    $numcellsleft = $numinrow - $rowcounter;
    
    if( $numcellsleft != $numinrow ) {
    
        for( $counter = 0; $counter < $numcellsleft; $counter ++ ) {
        
            echo "\t\t<td>-</td>\n";
            $emptycells ++;
        
        }
    
    }

?>
    </tr>
<tr>
<td colspan="3"><form action="<?php $_server['php_self']; ?>">
<input type="hidden" name="back" value="<?php echo "$thismonth"; ?>" />
<?php
if ($thismonth > $min){
    echo '<input type="submit" value="Back" />';
}
?>
</form>
</td><td><?php echo "$thismonth";?></td><td colspan="3">
<form action="<?php $_server['php_self']; ?>">
<input type="hidden" name="next" value="<?php echo "$thismonth"; ?>"
<?php
if ($thismonth < $max){
    echo '<input type="submit" value="Next" />';
}
?>
</form></td>
</tr>
</table>

 

which is working ok on first run,

however when you click next/ back the day the month starts on stays the same,

 

eg

this month is march so the calander looks like this

(first image)

but when i click back (february)

i get (second image)

 

any ideas?

 

cheers

 

 

[blueman378]

ah heres some better images,

notice how the start days are the same on both, they are correct for march as thats what they start on, but they dont update for other months

[blueman378]

well i believe i must modify this line:

 // create a calendar object
    $jd = cal_to_jd( CAL_GREGORIAN, date( "m" ),date( 1 ), date( "Y" ) );

i think i need to define the "m" as whatever month it is eg something like this

 // create a calendar object
    $jd = cal_to_jd( CAL_GREGORIAN, date( "$thismonth" ),date( 1 ), date( "Y" ) );

 

jsut dabling not to sure help appreciated (so is code optimization