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

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<sect1 id="language.function.include.php">
 <title>{include_php}</title>
  <note>
   <title>Technical Note</title>
   <para>
    {include_php} is pretty much deprecated from Smarty, you can
    accomplish the same functionality via a custom template function.
    The only reason to use {include_php} is if you really have a need to
    quarantine the php function away from the
    <link linkend="variable.plugins.dir">plugins</link>
    directory or your
    application code. See the <link
    linkend="tips.componentized.templates">componentized template
    example</link> for details.
   </para>
 </note>
 
 <informaltable frame="all">
  <tgroup cols="5">
   <colspec colname="param" align="center" />
   <colspec colname="type" align="center" />
   <colspec colname="required" align="center" />
   <colspec colname="default" align="center" />
   <colspec colname="desc" />
   <thead>
    <row>
     <entry>Attribute Name</entry>
     <entry>Type</entry>
     <entry>Required</entry>
     <entry>Default</entry>
     <entry>Description</entry>
    </row>
   </thead>
   <tbody>
    <row>
     <entry>file</entry>
     <entry>string</entry>
     <entry>Yes</entry>
     <entry><emphasis>n/a</emphasis></entry>
     <entry>The name of the php file to include</entry>
    </row>
    <row>
     <entry>once</entry>
     <entry>boolean</entry>
     <entry>No</entry>
     <entry><emphasis>true</emphasis></entry>
     <entry>whether or not to include the php file more than
      once if included multiple times</entry>
    </row>
    <row>
     <entry>assign</entry>
     <entry>string</entry>
     <entry>No</entry>
     <entry><emphasis>n/a</emphasis></entry>
     <entry>The name of the variable that the output of
      include_php will be assigned to</entry>
    </row>
   </tbody>
  </tgroup>
 </informaltable>

 <para>
  {include_php} tags are used to include a php script in your template.
  If <link linkend="variable.security">$security</link> is enabled,
  then the php script must be located in the <link
  linkend="variable.trusted.dir">$trusted_dir</link> path.
  The {include_php} tag must have the attribute
  "file", which contains the path to the included php file, either
  relative to
  <link linkend="variable.trusted.dir">$trusted_dir</link>,
  or an absolute path.
 </para>
 <para>
  By default, php files are only included once even if called
  multiple times in the template. You can specify that it should be
  included every time with the <emphasis>once</emphasis> attribute.
  Setting once to false will include the php script each time it is
  included in the template.
 </para>
 <para>
  You can optionally pass the <emphasis>assign</emphasis> attribute,
  which will specify a template variable name that the output of
  <emphasis>{include_php}</emphasis> will be assigned to instead of
  displayed.
 </para>
 <para>
  The smarty object is available as $this within the PHP script that you
  include.
 </para>
 <example>
  <title>function {include_php}</title>
  <para>load_nav.php</para>
  <programlisting role="php">
<![CDATA[
<?php

// load in variables from a mysql db and assign them to the template
require_once('MySQL.class.php');
$sql = new MySQL;
$sql->query('select * from site_nav_sections order by name',SQL_ALL);
$this->assign('sections',$sql->record);

?>
]]>
  </programlisting>
  <para>
   Where index.tpl is:
  </para>
  <programlisting>
<![CDATA[
{* absolute path, or relative to $trusted_dir *}
{include_php file='/path/to/load_nav.php'}

{foreach item="curr_section" from=$sections}
  <a href="{$curr_section.url}">{$curr_section.name}</a><br />
{/foreach}
]]>
  </programlisting>
 </example>
 <para>
  See also <link linkend="language.function.include">{include}</link>,
  <link linkend="language.function.php">{php}</link>, <link
  linkend="language.function.capture">{capture}</link>, <link
  linkend="template.resources">Template Resources</link> and <link
  linkend="tips.componentized.templates">Componentized
  Templates</link> </para>
</sect1>
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