栏目不同的项目符号 应该怎么写？

{$num[$key]}这样不对吗？

{$num = array(olymp-newsfeed-icon,olymp-manage-widgets-icon,olymp-manage-widgets-icon,olymp-manage-widgets-icon,olymp-manage-widgets-icon,olymp-manage-widgets-icon,olymp-manage-widgets-icon,olymp-manage-widgets-icon,olymp-manage-widgets-icon,olymp-manage-widgets-icon);}

{category module=share pid=0}
<li> <a href="03-Newsfeed.html">
<svg class="olymp-newsfeed-icon left-menu-icon" data-toggle="tooltip" data-placement="right" data-original-title="{$t.name}">
    <use xlink:href="{HOME_THEME_PATH}svg-icons/sprites/icons.svg#{$num[$key]}"></use>
</svg>
</a> 
</li>
{/category}