smarty/docs/en/programmers/api-variables/variable-compile-id.xml

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<sect1 id="variable.compile.id">
 <title>$compile_id</title>
 <para>
  Persistant compile identifier. As an alternative to passing the same
  compile_id to each and every function call, you can set this
  compile_id and it will be used implicitly thereafter.
 </para>
 <para>
  With a compile_id you can work around the limitation that you cannot
  use the same compile_dir for different template_dirs.  If you set a
  distinct compile_id for each template_dir then smarty can tell the
  compiled templates apart by their compile_id.
 </para>
 <para>
  If you have for example a prefilter that localizes your templates
  (that is: translates language dependend parts) at compile time, then
  you should use the current language as compile_id and you will get a
  set of compiled templates for each language you use.
 </para>
 <para>
  Another example would be to use the same compile directory across
  multiple domains / multiple vhosts. eg:
 </para>
 <example>
  <title>compile_id</title>
  <programlisting role="php">
<![CDATA[
   $smarty->compile_id = $_SERVER['SERVER_NAME'];
   $smarty->compile_dir = 'path/to/shared_compile_dir';
]]>
  </programlisting>
 </example>
</sect1>
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