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NOTE: OpCache settings for Magento on PHP 5.5.14 (Production Environment). Store/Update this file as /etc/php.d/opcache.ini Installation

yum install php-pecl-zendopcache

Note: In PHP version 5.5 it comes with a caching engine built-in – OpCache

We can rest OpCache via following method's:

1. Width validate_timestamps disabled, you must reset the OpCache manually or restart Apache for changes to the filesystem to take effect.

2. After each code deployment you can login to the Magento admin and goto the OpCache control panel and hit reset cache.

3. Use the command line reset by curling a page with something like this

<?php
require_once('app/Mage.php');
umask(0);
Mage::app();

$result = Mage::getSingleton('opcache/cache')->reset();
if ($result === TRUE) {
    echo 'Reset cache successful!';
} else {
    echo 'Reset cache failed!';
}
?>

Note: for above to work you need this extension: https://github.com/SchumacherFM/Magento-OpCache