No matter how careful you are when it comes to maintaining your WordPress site, errors and warnings could happen. You need to keep an eye on your error_log to make sure you catch them before they become something more serious. In addition, you need to make sure your turn “display_errors” off (either through cPanel or using ini_set function call) to make sure strangers don’t end up seeing sensitive information about your server. I recently noticed that one of my sites was displaying this message on a few pages after we upgraded to WordPress 4.0:
(tried to allocate XXXX bytes) in /home/ ... plugins/w3-total-cache/lib/W3/Cache/Apc.php on line
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