PHP ProductType::nav示例

 public function product_types_nav()
 {
     $output = '';
     $types = ProductType::nav();
     $output .= '<table class="ecommerce types">';
     $i = 0;
     $col_num = 4;
     foreach ($types as $type) {
         if ($i % $col_num == 0) {
             if ($i > 1) {
                 $output .= '</tr>';
                 $i = 0;
             }
             $output .= '<tr>';
         }
         $output .= '<td><a href="/products/types/' . $type->slug . '">' . $type->title . '</a></td>';
         $i++;
     }
     while ($i % $col_num != 0) {
         $output .= '<td>&nbsp;</td>';
         $i++;
     }
     $output .= '</tr></table>';
     return $output;
 }