paginadeel voor bestellijst/winkelwagen

bestellijst.php

<?php
session_start();
if ( !isset( $_SESSION[ 'bestellingen' ] ) )
   $_SESSION[ 'bestellingen' ]  =  array();

if ( isset( $_POST[ 'leegmaken' ) )
{
   $_SESSION[ 'bestellingen' ]  =  array();
}
elseif ( isset( $_POST[ 'product_id' ] ) )
{
   $product_id  =  1 * $_POST[ 'product_id' ];
   if ( !in_array( $product_id , $_SESSION[ 'bestellingen' ] ) )
      $_SESSION[ 'bestellingen' ][ $product_id ]  =  0;
   $_SESSION[ 'bestellingen' ][ $product_id ]++;
}

$bestellijst  =  array();
if ( !empty( $_SESSION[ 'bestellingen' ] ) )
{
   $db  =  new MySQLi( 'localhost' , 'root' , '' , 'webwinkel' );
   $sql = 'SELECT * FROM `producten` WHERE product_id IN(' . implode( ' , ' , array_keys( $_SESSION[ 'bestellingen' ] ) ) . ') ';
   $r  =  $db->query( $sql )
      OR die( '<h2>Oeps, er ging iets mis.</h2>' . $db->error . '<hr />' . $sql . '<pre>^^</pre>' );

   while ( $product = $r->fetch_assoc() )
      $bestellijst[]  =  $product + array( 'aantal' => $_SESSION[ 'bestellingen' ][ $product[ 'product_id' ] ] );
}

?>
<h2>Bestellingen</h2>
<?php if ( empty( $bestellijst ) ) : ?>
<p>Nog geen bestellingen</p>
<?php else : ?>
<table>
<thead><tr><td>product</td><td>aantal</td></tr></thead>
<tbody>
<?php foreach ( $bestellijst as $product ) : ?>
<tr><td><?php echo $product[ 'naam' ]; ?></td><td><?php echo $product[ 'aantal' ]; ?></td></tr>
<?php endforeach; ?>
</tbody>
<tfoot>
<tr><td colspan="2"
><form action="<?php echo $_SERVER[ 'REQUEST_URI' ]; ?>" method="POST">
<input type="hidden" name="leegmaken" value="TRUE :þ " />
<input type="submit" value="leegmaken" />
</form>
<form action="<?php echo $_SERVER[ 'REQUEST_URI' ]; ?>" method="GET">
<input type="hidden" name="pagina" value="bestellen " />
<input type="submit" value="afrekenen" />
</form>
</td></tr>
</tfoot>
</table>
<?php endif; ?>