Embedding Vars in Double Quotes

{func var="test $foo test"}       <-- sees $foo
{func var="test $foo_bar test"}   <-- sees $foo_bar
{func var="test $foo[0] test"}    <-- sees $foo[0]
{func var="test $foo[bar] test"}  <-- sees $foo[bar]
{func var="test $foo.bar test"}   <-- sees $foo (not $foo.bar)
{func var="test `$foo.bar` test"} <-- sees $foo.bar
{func var="test `$foo.bar` test"|escape} <-- modifiers outside quotes!

{* will replace $tpl_name with value *}
{include file="subdir/$tpl_name.tpl"}

{* doesn't replace $tpl_name *}
{include file='subdir/$tpl_name.tpl'} <--

{* must have backticks as it contains a . *}
{cycle values="one,two,`$smarty.config.myval`"}

{*  same as $module['contact'].'.tpl' in a php script
{include file="`$module.contact`.tpl"}

{*  same as $module[$view].'.tpl' in a php script
{include file="$module.$view.tpl"}