smarty/docs/en/designers/language-basic-syntax/language-syntax-quotes.xml

<?xml version="1.0" encoding="iso-8859-1"?>
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<sect1 id="language.syntax.quotes">
 <title>Embedding Vars in Double Quotes</title>
 <para>
  Smarty will recognize <link
  linkend="api.assign">assigned</link>
  <link   linkend="language.syntax.variables">variables</link>
  embedded in double quotes so long as the variable name contains only numbers,
  letters, underscores and brackets []. With any other characters (period,
  object reference, etc.) the variable must be surrounded by 
  <link linkend="language.syntax.quotes">backticks</link>. You
  cannot embed
  <link linkend="language.modifiers">modifiers</link>,
  they must always be applied outside of quotes.
 </para>
 <example>
  <title>embedded quotes syntax</title>
  <programlisting>
<![CDATA[
SYNTAX EXAMPLES:
{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!

PRACTICAL EXAMPLES:
{include file="subdir/$tpl_name.tpl"} <-- will replace $tpl_name with value
{cycle values="one,two,`$smarty.config.myval`"} <-- must have backticks
]]>
  </programlisting>
 </example>
 <para>
  See also <link linkend="language.modifier.escape">escape</link>.
 </para>
</sect1>

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