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    <p>As Bokan has mentioned, you can up the memory if available, and he is right on how counter productive setting TTL to 0 is.</p> <p><strong>NotE: This is how I fixed this error for my particular problem. Its a generic issue that can be caused by allot of things so only follow the below if you get the error and you think its caused by duplicate PHP files being loaded into APC.</strong></p> <p>The issue I was having was when I released a new version of my PHP application. Ie replaced all my .php files with new ones APC would load both versions into cache.</p> <p>Because I didnt have enough memory for two versions of the php files APC would run out of memory.</p> <p>There is a option called apc.stat to tell APC to check if a particular file has changed and if so replace it, this is typically ok for development because you are constantly making changes however on production its usually turned off as it was with in my case - <a href="http://www.php.net/manual/en/apc.configuration.php#ini.apc.stat" rel="nofollow">http://www.php.net/manual/en/apc.configuration.php#ini.apc.stat</a></p> <p>Turning apc.stat on would fix this issue if you are ok with the performance hit.</p> <p>The solution I came up with for my problem is check if the the project version has changed and if so empty the cache and reload the page. </p> <pre><code>define('PROJECT_VERSION', '0.28'); if(apc_exists('MY_APP_VERSION') ){ if(apc_fetch('MY_APP_VERSION') != PROJECT_VERSION){ apc_clear_cache(); apc_store ('MY_APP_VERSION', PROJECT_VERSION); header('Location: ' . 'http'.(empty($_SERVER['HTTPS'])?'':'s').'://'.$_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI']); exit; } }else{ apc_store ('MY_APP_VERSION', PROJECT_VERSION); } </code></pre>
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