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

<?xml version="1.0" encoding="UTF-8"?>
<!-- $Revision$ -->
<sect1 id="language.syntax.quotes">
 <title>Embedding Vars in Double Quotes</title>

 <itemizedlist>
  <listitem>
 <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, under_scores and brackets[].
  See <ulink url="&url.php-manual;language.variables">naming</ulink>
  for more detail.
  </para></listitem>

  <listitem><para>
  With any other characters, for example a .period or
  <literal>$object>reference</literal>, then the variable must be
  surrounded by  <literal>`backticks`</literal>.
  </para></listitem>

  <listitem><para>You cannot embed
  <link linkend="language.modifiers">modifiers</link>, they must always
  be applied outside of quotes.
 </para></listitem>
 </itemizedlist>

 <example>
  <title>Syntax examples</title>
  <programlisting>
<![CDATA[
{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!
]]>
  </programlisting>
</example>

 <example>
  <title>Practical examples</title>
  <programlisting>
<![CDATA[
{* 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"}
]]>
  </programlisting>
 </example>

 <para>
  See also <link linkend="language.modifier.escape"><varname>escape</varname></link>.
 </para>
</sect1>

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