smarty/docs/en/programmers/api-functions/api-clear-config.xml

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<refentry id="api.clear.config">
 <refnamediv>
  <refname>clear_config</refname>
  <refpurpose></refpurpose>
 </refnamediv>
 <refsect1>
  <title />
  <methodsynopsis>
   <type>void</type><methodname>clear_config</methodname>
   <methodparam choice="opt"><type>string</type><parameter>var</parameter></methodparam>
  </methodsynopsis>
  <para>
   This clears all assigned config variables. If a variable name is
   supplied, only that variable is cleared.
  </para>
  <example>
   <title>clear_config</title>
   <programlisting role="php">
<![CDATA[
<?php
// clear all assigned config variables.
$smarty->clear_config();

// clear one variable
$smarty->clear_config('foobar');
?>
]]>
   </programlisting>
  </example>
 </refsect1>
</refentry>
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