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>$cache_lifetime</H1
><P
> This is the length of time in seconds that a template cache is valid.
Once this time has expired, the cache will be regenerated.
</P
><P
></P
><UL
><LI
><P
> <TT
CLASS="parameter"
><I
>$caching</I
></TT
> must be turned on (either 1 or 2) for
<TT
CLASS="parameter"
><I
>$cache_lifetime</I
></TT
> to have any purpose.
</P
></LI
><LI
><P
> A value of -1 will force the cache to never expire.
</P
></LI
><LI
><P
>A value of 0 will cause
the cache to always regenerate (good for testing only, to disable caching
a more efficient method is to set <A
HREF="variable.caching.html"
><TT
CLASS="parameter"
><I
>$caching</I
></TT
></A
> = 0).
</P
></LI
><LI
><P
> If you want to give certain templates their own cache lifetime, you could
do this by setting <A
HREF="variable.caching.html"
> <TT
CLASS="parameter"
><I
>$caching</I
></TT
></A
> = 2,
then set <TT
CLASS="parameter"
><I
>$cache_lifetime</I
></TT
> to a unique value just
before calling <A
HREF="api.display.html"
><TT
CLASS="varname"
>display()</TT
>
</A
> or <A
HREF="api.fetch.html"
><TT
CLASS="varname"
>fetch()</TT
></A
>.
</P
></LI
></UL
><P
> If <A
HREF="variable.force.compile.html"
> <TT
CLASS="parameter"
><I
>$force_compile</I
></TT
></A
> is
enabled, the cache files will be regenerated every time, effectively
disabling caching. You can clear all the cache files with the <A
HREF="api.clear.all.cache.html"
><TT
CLASS="varname"
>clear_all_cache()</TT
></A
>
function, or individual cache files (or groups) with the <A
HREF="api.clear.cache.html"
><TT
CLASS="varname"
>clear_cache()</TT
></A
> function.
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