oscommerce二次开发问题

<?php
  if ($oscTemplate->hasBlocks('boxes_column_left')) {
?>

<div id="columnLeft" class="grid_<?php echo $oscTemplate->getGridColumnWidth(); ?> pull_<?php echo $oscTemplate->getGridContentWidth(); ?>">
  <?php echo $oscTemplate->getBlocks('boxes_column_left'); ?>
</div>

 function hasBlocks($group) {
      return (isset($this->_blocks[$group]) && !empty($this->_blocks[$group]));
    }

    function getBlocks($group) {
      if ($this->hasBlocks($group)) {
        return implode("\n", $this->_blocks[$group]);
      }
    }