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Smarty does kick butt. I can't imagine not using it. Especially because I work with designers who do not know php.
Personally I like using smarty's <{ foreach }> rather than sections, but your example above does show off how powerful smarty can be.
Here is an example of how you can use your smarty output with foreach instead of sections
<{foreach item=item key=key from=$multiple_array}>
<{$item.lang_worklogrows}> <br/>
<{$item.lang_mbiz_unit}> <br />
<{foreach item=subitem key=subkey from=$item.lang_while_val}>
<{$subitem.signin_date}>
<{/foreach}>
<{/foreach}>
That example isn't using your full array, but perhaps you get the picture. I just find <{ foreach }> a little cleaner for my scrambled brain to grasp.