page list columns

<?php //to auto break list of pages into colunms
$list = wp_list_pages('title_li=&depth=1&echo=0&child_of='.$post->ID.'&sort_column=menu_order&show_date=modified&date_format=$date_format');?>
'); //keep 'echo=0' and 'depth=1'; add all your parameters;
$list_elements = explode('</li>', $list);
$num = count($list_elements)-1;
$num_col = 5; //CHANGE HERE FOR THE NUMBER OF ITEMS PER COLUMN
$col = ceil($num/$num_col);

$width = floor(100/$col)-5;
$style = 'width:'.$width.'%;margin-right:2%;padding-left:3%;float:left;';

for( $i=1; $i<$col; $i++) { $list_elements[$i*$num_col] = '</ul><ul style="'.$style.'">'.$list_elements[$i*$num_col]; }
$list = implode('</li>', $list_elements); ?>

<ul class="page-list-columns" style=" <?php echo $style; ?>">
<?php echo $list; ?>
</ul>