smarty/docs/en/programmers/api-variables/variable-security-settings.xml

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     <sect1 id="variable.security.settings">
      <title>$security_settings</title>
      <para>
       These are used to override or specify the security settings when
<link linkend="variable.security">security is enabled</link>.
These are the possible settings:
      </para>
      <itemizedlist>
<listitem>
 <para>
  PHP_HANDLING - true/false. If set to true, the
  <link linkend="variable.php.handling">$php_handling</link>
  setting is not checked for security.
 </para>
</listitem>
<listitem>
 <para>
  IF_FUNCS - This is an array of the names of permitted PHP functions in
  <link linkend="language.function.if">IF</link> statements.
 </para>
</listitem>
<listitem>
 <para>
  INCLUDE_ANY - true/false. If set to true, any
         template can be included from the file system, regardless of the
  <link linkend="variable.secure.dir">$secure_dir</link> list.
 </para>
</listitem>
<listitem>
 <para>
  PHP_TAGS - true/false. If set to true,
  <link linkend="language.function.php">{php}{/php}</link>
  tags are permitted in the templates.
 </para>
</listitem>
<listitem>
 <para>
  MODIFIER_FUNCS - This is an array of the names of permitted
  PHP functions used as variable modifiers.
 </para>
</listitem>
<listitem>
 <para>
  ALLOW_CONSTANTS - true/false. If set to true, constants via
  <link linkend="language.variables.smarty.const">{$smarty.const.name}</link>
  are allowed in the templates. The defaults is set to
  "false" for security.
 </para>
</listitem>
      </itemizedlist>
</sect1>
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