在php数组ksort中排序输出结果？

I need help, sort for this output result bellow my website code :

           <?php 
           foreach ($this->system->produk as $pr_key=>$pr_val):
           if ($pr_val->status == 'on'):?>
          <li>
            <a href="<?php echo site_url(str_replace('_','-',$pr_key));?>"><?php echo $pr_val->nama;?></a>
          </li>
          <?php endif;?>
          <?php endforeach;?>

any idea how to sort this output ?

Did you try ?

<?php 
 sort($this->system->produk);
 foreach ($this->system->produk as $pr_key=>$pr_val):
           if ($pr_val->status == 'on'):?>
          <li>
            <a href="<?php echo site_url(str_replace('_','-',$pr_key));?>"><?php echo $pr_val->nama;?></a>
          </li>
          <?php endif;?>
  <?php endforeach;?>