smarty/docs/en/programmers/api-variables/variable-caching.xml

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     <sect1 id="variable.caching">
      <title>$caching</title>
      <para>
	   This tells Smarty whether or not to cache the output of the templates.
	   By default this is set to 0, or disabled. If your templates generate
	   redundant redundant content, it is advisable to turn on caching. This
	   will result in significant performance gains. You can also have multiple
	   caches for the same template. A value of 1 or 2 enables caching. 1 tells
	   Smarty to use the current
	   <link linkend="variable.cache.lifetime">$cache_lifetime</link>
	   variable to determine if the
	   cache has expired. A value of 2 tells Smarty to use the cache_lifetime
	   value at the time the cache was generated. This way you can set the
	   cache_lifetime just before fetching the template to have granular
	   control over when that particular cache expires.
	   See also <link linkend="api.is.cached">is_cached()</link>.
      </para>
      <para>
	   If <link linkend="variable.compile.check">$compile_check</link>
	   is enabled, the cached content will be regenerated if
	   any of the templates or config files that are part of this cache are
	   changed. If
	   <link linkend="variable.force.compile">$force_compile</link>
	   is enabled, the cached content will always be
	   regenerated.
      </para>
</sect1>
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