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<div class="sect1" title="$cache_lifetime">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="variable.cache.lifetime"></a>$cache_lifetime</h2></div></div></div>
<p>
This is the length of time in seconds that a template cache is valid.
Once this time has expired, the cache will be regenerated.
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>
<em class="parameter"><code>$caching</code></em> must be turned on (either 1 or 2) for
<em class="parameter"><code>$cache_lifetime</code></em> to have any purpose.
</p></li>
<li class="listitem"><p>
A <em class="parameter"><code>$cache_lifetime</code></em> value of -1 will force the cache to never expire.
</p></li>
<li class="listitem"><p>A value of 0 will cause
the cache to always regenerate (good for testing only, to disable caching
a more efficient method is to set <a class="link" href="variable.caching.html" title="$caching"><em class="parameter"><code>$caching</code></em></a> = 0).
</p></li>
<li class="listitem"><p>
If you want to give certain templates their own cache lifetime, you could
do this by setting <a class="link" href="variable.caching.html" title="$caching">
<em class="parameter"><code>$caching</code></em></a> = 2,
then set <em class="parameter"><code>$cache_lifetime</code></em> to a unique value just
before calling <a class="link" href="api.display.html" title="display()"><code class="varname">display()</code>
</a> or <a class="link" href="api.fetch.html" title="fetch()"><code class="varname">fetch()</code></a>.
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<p>
If <a class="link" href="variable.force.compile.html" title="$force_compile">
<em class="parameter"><code>$force_compile</code></em></a> is
enabled, the cache files will be regenerated every time, effectively
disabling caching. You can clear all the cache files with the <a class="link" href="api.clear.all.cache.html" title="clear_all_cache()"><code class="varname">clear_all_cache()</code></a>
function, or individual cache files (or groups) with the <a class="link" href="api.clear.cache.html" title="clear_cache()"><code class="varname">clear_cache()</code></a> function.
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