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POPHP / MySQL site using caching. What makes this work most of the time?
 

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  1. POPHP / MySQL site using caching. What makes this work most of the time?
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    <p>Our previous webmaster set up this site and the caching he set up works fine for most browsers but I have found that some versions of Opera don't work and some online SEO tools like <a href="http://www.submitexpress.com/analyzer/" rel="nofollow">Submit Express Analyzer</a>. I suspect that it's an issue with headers. I've read about ob_start("ob_gzhandler") but I'm not sure how I can implement it in this scenario.</p> <p>The site is all controlled by a router file, unique controller files for each type of page and .htaccess. In the router file, the code below is set in place to look for a cached version of the page and load the content, otherwise, load the page.</p> <p>The caching compresses the page content with gzencode and stores it in the database in a cache table with a uri hash. If the cached file exists, the content is pulled from the database.</p> <p>Opera displays a blank page and the Submit Express Test does not recognize a page. I am almost certain that the .htaccess file has nothing to do with the issue. The code below is where I think the issue resides.</p> <pre><code>&lt;?php $loadTime = microtime(true); session_start(); if (!isset($_SESSION['var'])) $_SESSION['var'] = rand(0, 2); if (!isset($_SESSION['var2'])) $_SESSION['var2'] = rand(0, 4); require(dirname(__FILE__).'/config/common.php'); $uri = $_SERVER['REQUEST_URI']; $request = explode('/', substr($uri, 1)); $request = preg_replace('/\..*/', '', $request); $uriHash = sha1($uri); if($uri == '/') //This is the Index... { </code></pre> <p>Irrelevant Index Code</p> <pre><code>} try { // LOOKS FOR CACHE IN DB BASED ON URI $cache = $GLOBALS['db']-&gt;getRow("SELECT * FROM cache_tbl WHERE uri_hash = '$uriHash'"); }catch ( Exception $e ) { $cache = array(); } if ( !empty($cache) &amp;&amp; ($cache['mod_date'] * 60 * 60 * 24) &gt; $loadTime ) { // IF NO CACHE IN DB, SETS HEADERS FOR COMPRESS OR NO COMPRESS $HTTP_ACCEPT_ENCODING = $_SERVER["HTTP_ACCEPT_ENCODING"]; if( headers_sent() ) $encoding = false; else if( strpos($HTTP_ACCEPT_ENCODING, 'x-gzip') !== false ) $encoding = 'x-gzip'; else if( strpos($HTTP_ACCEPT_ENCODING,'gzip') !== false ) $encoding = 'gzip'; else $encoding = false; $compressed = $cache['contents']; if ( $encoding ) { header("Content-Encoding: ".$encoding); echo $compressed; } } else { if ($request[0] == 'venues') { header("HTTP/1.1 301 Moved Permanently"); header('Location: '.HOST.$request[1].'.html'); } </code></pre> <p>More Code</p> <pre><code>if ( // Irrelevant Conditions ) { $contents = ob_get_clean(); echo $contents; $compressed = gzencode($contents, 7); try { Admin::add('cache_tbl', array('uri_hash' =&gt; $uriHash, 'contents' =&gt; $compressed, 'mod_date' =&gt; $loadTime)); } catch(Exception $e) { ; } ob_end_flush(); } } </code></pre> <p>There's a lot going on in this file and I tried to cut out as much stuff as possible to eliminate confusion. Any help is obviously greatly appreciated! Thanks in advance!</p>
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      1. POPHP / MySQL site using caching. What makes this work most of the time?
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    1. COWould you consider providing a link that displays okay in other browsers but fails in Opera?
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    2. COSorry, I can't... confidentiality reasons.
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    3. COWelp, it's most likely an HTTP error. Some HTTP clients (browsers) are more forgiving than others.
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