以下.tpl文件如何工作以显示表

Question

Following is a code given in book

    {* products_list.tpl *}
    {load_presentation_object filename="products_list" assign="obj"}

      {if $obj->mProducts}
      <table class="product-list" border="0">
      <tbody>
      {section name=k loop=$obj->mProducts}
      {if $smarty.section.k.index % 2 == 0}
      <tr>
      {/if}
    <td valign="top">
    <h3 class="product-title">
    <a href="{$obj->mProducts[k].link_to_product}">
    {$obj->mProducts[k].name}
    </a>
    </h3>
    <p>
    {if $obj->mProducts[k].thumbnail neq ""}
    <a href="{$obj->mProducts[k].link_to_product}">
    <img src="{$obj->mProducts[k].thumbnail}"
    alt="{$obj->mProducts[k].name}" />
    </a>
    {/if}
    {$obj->mProducts[k].description}
    </p>

    <p class="section">
    Price:
    {if $obj->mProducts[k].discounted_price != 0}
    <span class="old-price">{$obj->mProducts[k].price}</span>
    <span class="price">{$obj->mProducts[k].discounted_price}</span>
    {else}
    <span class="price">{$obj->mProducts[k].price}</span>
    {/if}
    </p>
    </td>
    {if $smarty.section.k.index % 2 != 0 && !$smarty.section.k.first ||
    $smarty.section.k.last}
    </tr>
    {/if}
    {/section}
    </tbody>
    </table>
    {/if}

I am not clear with following line

  {if $smarty.section.k.index % 2 == 0}

why is the above statement written to see if index is an even number or odd number what effect does this have on table displayed?

Answer 1

It's creating new table row every two array items.

 //open
 {if $smarty.section.k.index % 2 == 0}
   <tr>
 {/if}

 //close
 {if $smarty.section.k.index % 2 != 0 && !$smarty.section.k.first ||
     $smarty.section.k.last}
     </tr>
 {/if}

Take a look at this example:

 echo "<table border='1'>
";

 for($i = 0; $i<=10; $i++) {

   if ($i % 2 == 0) {
       echo "<tr>
";
   }

   echo "<td> ". $i. "contents </td> 
"; 

   if ($i % 2 != 0) {
       echo "</tr> 
";
   }

}

 echo "<table />
";