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

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