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    <p>I have a simple algo for HTML caching, predicated on the following conditions</p> <ul> <li>The user is a guest (logged on users have a blog_user cookie set)</li> <li>The request URI is a GET that contains no request parameters</li> <li>An HTML cache version of the file exists</li> </ul> <p>then an <code>.htaccess</code>rewrite rule kicks in, mapping the request to a cached file. Anything else is assumed to be context-specific and therefore not cacheable. Note that I use wikipedia-style URI mapping for my blog so <code>/article-23</code> gets mapped to <code>/index.php=article-23</code> when not cached. </p> <p>I use a single HTML access file in my DOCUMENT_ROOT directory and here is the relevant extract. It's the third rewrite rule that does what you want. Any script which generates cacheable O/P wraps this in an <code>ob_start()</code> <code>ob_get_clean()</code> pair and write out the HTML cache file (though this is all handled by my templating engine). Updates also flush the HTML cache directory as necessary.</p> <pre><code>RewriteEngine on RewriteBase / # ... # Handle blog index RewriteRule ^blog/$ blog/index [skip=1] # If the URI maps to a file that exists then stop. This will kill endless loops RewriteCond %{REQUEST_FILENAME} -f RewriteRule ^blog/.* - [last] # If the request is HTML cacheable (a GET to a specific list, with no query params) # the user is not logged on and the HTML cache file exists then use it instead of executing PHP RewriteCond %{HTTP_COOKIE} !blog_user RewriteCond %{REQUEST_METHOD}%{QUERY_STRING} =GET [nocase] RewriteCond %{DOCUMENT_ROOT}/blog/html_cache/$1.html -f RewriteRule ^blog/(article-\d+|index|sitemap.xml|search-\w+|rss-[0-9a-z]*)$ \ blog/html_cache/$1.html [last] # Anything else relating to the blog pass to index.php RewriteRule blog/(.*) blog/index.php?page=$1 [qsappend,last] </code></pre> <p>Hope this helps. My blog describes this in more detail. :-) </p>
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