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

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     <sect1 id="variable.cache.dir">
      <title>$cache_dir</title>
      <para>
       This is the name of the directory where template caches are
       stored. By default this is
       <filename class="directory">./cache</filename>, meaning that
       Smarty will look for the <filename class="directory">cache/</filename> directory
        in the same directory  as the executing php script.
       <emphasis role="bold">This directory must
     be writeable by the web server</emphasis>,
     <link linkend="installing.smarty.basic">see install</link> for more info.
     </para>
     <para>
     You can also use your own
       <link linkend="section.template.cache.handler.func">
       custom cache handler</link>
       function to control cache files, which will ignore this
       setting.
       See also
       <link linkend="variable.use.sub.dirs"><parameter>$use_sub_dirs</parameter></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"><parameter>$caching</parameter></link>,
  <link linkend="variable.use.sub.dirs"><parameter>$use_sub_dirs</parameter></link>,
  <link linkend="variable.cache.lifetime"><parameter>$cache_lifetime</parameter></link>,
  <link linkend="variable.cache.handler.func"><parameter>$cache_handler_func</parameter></link>,
  <link linkend="variable.cache.modified.check"><parameter>$cache_modified_check</parameter></link>
  and the
  <link linkend="caching">caching section</link>.
  </para>
</sect1>

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