smarty/docs/en/programmers/api-variables/variable-php-handling.xml

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     <sect1 id="variable.php.handling">
      <title>$php_handling</title>
      <para>
       This tells Smarty how to handle PHP code embedded in the
       templates. There are four possible settings, the default being
       <constant>SMARTY_PHP_PASSTHRU</constant>. Note that this does NOT affect
       php code within <link linkend="language.function.php">
       <varname>{php}{/php}</varname></link> tags in the template.
      </para>


      <itemizedlist>
       <listitem><para>
       <constant>SMARTY_PHP_PASSTHRU</constant> - Smarty echos tags as-is.
       </para></listitem>

       <listitem><para>
       <constant>SMARTY_PHP_QUOTE</constant> - Smarty quotes the tags as
         html entities.
         </para></listitem>

       <listitem><para>
       <constant>SMARTY_PHP_REMOVE</constant> - Smarty removes the tags from
         the templates.</para></listitem>

       <listitem><para>
       <constant>SMARTY_PHP_ALLOW</constant> - Smarty will execute the tags
         as PHP code.</para></listitem>
      </itemizedlist>

       <note>
       <para>
        Embedding PHP code into templates is highly discouraged.
        Use <link linkend="plugins.functions">custom functions</link> or
        <link linkend="plugins.modifiers">modifiers</link> instead.
       </para>
      </note>
</sect1>
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