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<H2><A NAME="5_1">5.1 Enabling the cache system</A></H2>
<P> The enabling disabling of the cache system is controlled by two
 defines (in jpg-config.php)</P>
<P><DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
&nbsp;DEFINE</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
&quot;USE_CACHE&quot;</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
true</FONT><FONT color="#007700">);
<BR></FONT><FONT color="#0000BB">DEFINE</FONT><FONT color="#007700">(</FONT><FONT
color="#DD0000">&quot;READ_CACHE&quot;</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
true</FONT><FONT color="#007700">)</FONT><FONT color="#0000BB"></FONT></FONT>
</CODE></DIV></P>
<P></P>
<P> The first of these, USE_CACHE, is the master-switch which must be
 set to true to enable the caching system. The second switch READ_CACHE
 very seldom needs to be changed.</P>
<P> This second switch basically tells whether or not JpGraph should
 ever look in the cache. Setting this to false and the master-switch to
 true would then always generate an new updated image file in the cache
 and this new image would be send back to the browser. The main use for
 this (admittedly) strange setting is if you like to have the side
 effect of the script that a fresh image is always stored in the cache
 directory.</P>
<P> Once you have enabled the cache you must also make sure that a valid
 cache directory is setup. The cache directory is specified with the
 define</P>
<P><DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
&nbsp;DEFINE</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
&quot;CACHE_DIR&quot;</FONT><FONT color="#007700">,</FONT><FONT color="#DD0000">
&quot;/tmp/jpgraph_cache/&quot;</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB">
</FONT></FONT></CODE></DIV></P>
<P></P>
<P> You can of course change the default directory to whatever directory
 you fancy. But, you must remember one important thing.<STRONG> The
 cache directory must be writable for the user running Apache/PHP</STRONG>
.</P>
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