smarty/docs/en/programmers/api-variables/variable-cache-dir.xml

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     <sect1 id="variable.cache.dir">
      <title>$cache_dir</title>
      <para>
       This is the name of the directory where template caches are
       stored. By default this is
       <filename class="directory">"./cache"</filename>, meaning that
       Smarty will look for the cache directory in the same directory
       as the executing php script.
       <emphasis role="bold">This directory must
     be writeable by the web server</emphasis>
     (<link linkend="installing.smarty.basic">see install</link>).
     You can also use your own
       <link linkend="section.template.cache.handler.func">
       custom cache handler</link>
       function to control cache files, which will ignore this
       setting.
       See also
       <link linkend="variable.use.sub.dirs">$use_sub_dirs</link>.
      </para>
      <note>
       <title>Technical Note</title>
       <para>
        This setting must be either a relative or
        absolute path. include_path is not used for writing files.
       </para>
      </note>
      <note>
       <title>Technical Note</title>
       <para>
        It is not recommended to put this directory under
        the web server document root.
       </para>
      </note>

  <para>
  See also
  <link linkend="variable.caching">$caching</link>,
  <link linkend="variable.use.sub.dirs">$use_sub_dirs</link>,
  <link linkend="variable.cache.lifetime">$cache_lifetime</link>,
  <link linkend="variable.cache.handler.func">$cache_handler_func</link>,
  <link linkend="variable.cache.modified.check">$cache_modified_check</link>
  and
  <link linkend="caching">Caching section</link>.
  </para>
</sect1>

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