smarty/docs/en/designers/language-builtin-functions/language-function-php.xml

<?xml version="1.0" encoding="iso-8859-1"?>
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<sect1 id="language.function.php">
 <title>{php}</title>
 <para>
  {php} tags allow php to be embedded directly into the template. They
  will not be escaped, regardless of the <link
  linkend="variable.php.handling">$php_handling</link> setting. This
  is for advanced users only, not normally needed.
 </para>
 <example>
  <title>{php} tags</title>
  <programlisting role="php">
<![CDATA[
{php}
   // including a php script directly
   // from the template.
   include('/path/to/display_weather.php');
{/php}
]]>
  </programlisting>
 </example>
<note>
<title>Technical Note</title>
<para>
   To access PHP variables in {php} blocks you may need to use the PHP
   <ulink url="&url.php-manual;global">global</ulink>
   keyword.
</para>
</note>

 <example>
  <title>{php} tags with global</title>
  <programlisting role="php">
<![CDATA[
{php}
   global $foo, $bar;
   if($foo == $bar){
     // do something
   }
{/php}
]]>
  </programlisting>
 </example>
 
 <para>
  See also
  <link linkend="variable.php.handling">$php_handling</link>,
  <link linkend="language.function.include.php">{include_php}</link>,
  <link linkend="language.function.include">{include}</link> and
  <link linkend="tips.componentized.templates">Componentized Templates</link>.
 </para>
</sect1>
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