SMARTY - How to display template variables

I've been working with the Smarty Template Engine with display_errors = Off. Turning it on, I realize that just leaving:

<li{$page['home']}>...</li>
<li{$page['about']}>...</li>

where,

$page['home'] = ' class="current"';
$this->smarty->assign("page", $page);

gives me an error, saying that $page['about'] is not defined.

As of now, I see my options are to either turn display_errors = Off or to do this:

<li{if isset($page['home'])}{$page['home']}{/if}>...</li>
<li{if isset($pag开发者_C百科e['about'])}{$page['about']}{/if}>...</li>

Any reason why I should use one over the other? Or any better solution? Thanks.

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In short, no difference...

BUT, it's much safer to define your empty variables as NULL. This protects you from leftovers, or things coming from other pages that you forgot about later, etc... It's just being safe.

A lot of people swear by making unused variables (that COULD be set) to NULL before starting to use them.