Title: [Plugin: WP Super Cache] PHP Warning re missing array / wp-cache-phase2.php Last modified: August 20, 2016 --- # [Plugin: WP Super Cache] PHP Warning re missing array / wp-cache-phase2.php * [lwdgrfx](https://wordpress.org/support/users/lwdgrfx/) * (@lwdgrfx) * [13 years, 8 months ago](https://wordpress.org/support/topic/plugin-wp-super-cache-php-warning-re-missing-array-wp-cache-phase2php/) * Hi, Donncha – I’m trying to track down the source of this warning: * PHP Warning: in_array() expects parameter 2 to be array, null given in (my domain)/ wp-content/plugins/wp-super-cache/wp-cache-phase2.php on line * My error log is showing this warning every few seconds and has been for the past few days. I started looking to see what the problem might be since we had ‘site unavailable’ warnings for posters. The cache itself is doing an excellent job. It’s a high-traffic site (for us, at least), and recently reached 80,000 posts on one day. This is a new problem, though. * Will appreciate any help. * [http://wordpress.org/extend/plugins/wp-super-cache/](http://wordpress.org/extend/plugins/wp-super-cache/) Viewing 6 replies - 1 through 6 (of 6 total) * Thread Starter [lwdgrfx](https://wordpress.org/support/users/lwdgrfx/) * (@lwdgrfx) * [13 years, 8 months ago](https://wordpress.org/support/topic/plugin-wp-super-cache-php-warning-re-missing-array-wp-cache-phase2php/#post-2943511) * Incidentally, where I write ‘on line’ above, the actual error message says ‘on line 78’ – which is this: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 78 and 79: if (! in_array($script, $cache_acceptable_files) && wp_cache_is_rejected($wp_cache_request_uri)){ if ( isset( $GLOBALS[ ‘wp_super_cache_debug’ ] ) && $GLOBALS[ ‘wp_super_cache_debug’]) wp_cache_debug( ‘URI rejected. Not Caching’, 2 ); ~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~ This is the code surrounding it: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ (Line 67) if ( isset( $_GET[ ‘preview’ ] ) ) { if ( isset( $GLOBALS[ ‘wp_super_cache_debug’])&& $GLOBALS[ ‘wp_super_cache_debug’ ] ) wp_cache_debug( ‘Not caching preview post.’, 2 ); return false; } * if ( !empty( $_GET ) ) { if ( isset( $GLOBALS[ ‘wp_super_cache_debug’ ] ) && $GLOBALS[ ‘wp_super_cache_debug’ ] ) wp_cache_debug( ‘Supercache caching disabled. Only using wp-cache. Non empty GET request.’, 5 ); $super_cache_enabled = false;} * $script = basename($_SERVER[‘PHP_SELF’]); if (!in_array($script, $cache_acceptable_files)&& wp_cache_is_rejected($wp_cache_request_uri)) { if ( isset( $GLOBALS[ ‘wp_super_cache_debug’])&& $GLOBALS[ ‘wp_super_cache_debug’ ] ) wp_cache_debug( ‘URI rejected. Not Caching’, 2 ); return false; } if (wp_cache_user_agent_is_rejected()) { if ( isset( $GLOBALS[‘ wp_super_cache_debug’ ] ) && $GLOBALS[ ‘wp_super_cache_debug’ ] ) wp_cache_debug(“ USER AGENT ({$_SERVER[ ‘HTTP_USER_AGENT’ ]}) rejected. Not Caching”, 4 ); return;} if($wp_cache_gzip_encoding) header(‘Vary: Accept-Encoding, Cookie’); else header(‘ Vary: Cookie’); ob_start( ‘wp_cache_ob_callback’ ); if ( isset( $GLOBALS[ ‘wp_super_cache_debug’])&& $GLOBALS[ ‘wp_super_cache_debug’ ] ) wp_cache_debug( ‘Created output buffer’, 4 ); * // restore old supercache file temporarily ~~~~~~~~~~~~~~~~~~~~~~~~~~` * Thread Starter [lwdgrfx](https://wordpress.org/support/users/lwdgrfx/) * (@lwdgrfx) * [13 years, 8 months ago](https://wordpress.org/support/topic/plugin-wp-super-cache-php-warning-re-missing-array-wp-cache-phase2php/#post-2943614) * Does anyone else have any idea what is causing this PHP error? If I can’t find it, I’m going to have to uninstall Super Cache. * Plugin Author [Donncha O Caoimh (a11n)](https://wordpress.org/support/users/donncha/) * (@donncha) * [13 years, 7 months ago](https://wordpress.org/support/topic/plugin-wp-super-cache-php-warning-re-missing-array-wp-cache-phase2php/#post-2943616) * Did you check the contents of the second parameter, it should be this (taken from the config file wp-content/wp-cache-config.php) * > $cache_acceptable_files = array( ‘wp-comments-popup.php’, ‘wp-links-opml.php’,‘ > wp-locations.php’ ); * Thread Starter [lwdgrfx](https://wordpress.org/support/users/lwdgrfx/) * (@lwdgrfx) * [13 years, 7 months ago](https://wordpress.org/support/topic/plugin-wp-super-cache-php-warning-re-missing-array-wp-cache-phase2php/#post-2943618) * Thanks, Donncha. I was thinking the other day it would be great to see all my Super Cache settings on one page instead of going through the tabs one by one. I had never looked at ‘wp-content/wp-cache-config.php’ before but there they are and that will be a great place to keep track of what’s set how. * Since I didn’t know what was causing the error, I actually deactivated SuperCache on Thursday and was wondering what to do when we received a comment on Friday from someone saying she could not find any posts from Thursday. I decided to reactivate it, changed a few settings (which I’m now going to review to see what’s different plus compare to the ‘wp-content/wp-cache-config.php’ file and do screenshots of settings since the configuration is now working correctly and I’m getting no PHP errors at all. * This ‘wp-content/wp-cache-config.php’ file did, in fact (after the re-activation) show this: ============================= $cache_acceptable_files = array( ‘wp- comments-popup.php’, ‘wp-links-opml.php’, ‘wp-locations.php’ ); ============= ================ so that seems to have been the problem causing the error warning. What I don’t know is what setting would have changed that but, as I say, I’m now planning to review them all. * I’m waiting for my posters to tell me if their posting is going better now or if the ‘site unavailable’ message was caused by something else. When I mentioned the ‘site unavailable’ messages to my hosting support, he pointed me to the php errors log where the error I mention above was the only one it showed. * Thread Starter [lwdgrfx](https://wordpress.org/support/users/lwdgrfx/) * (@lwdgrfx) * [13 years, 7 months ago](https://wordpress.org/support/topic/plugin-wp-super-cache-php-warning-re-missing-array-wp-cache-phase2php/#post-2943625) * Oh…I spoke too soon… * We just had several instances of ‘site unavailable’ happen and I now have PHP errors again. They’re not the same as those I had earlier this week but they’re similar. Here they are: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ [03-Aug-2012 16: 49:09] PHP Warning: in_array() [[function.in-array](https://wordpress.org/support/topic/plugin-wp-super-cache-php-warning-re-missing-array-wp-cache-phase2php/function.in-array?output_format=md)]: Wrong datatype for second argument in (my domain)/wp-content/plugins/wp-super- cache/wp-cache-phase2.php on line 78 [07-Aug-2012 11:07:02] PHP Warning: in_array()[ [function.in-array](https://wordpress.org/support/topic/plugin-wp-super-cache-php-warning-re-missing-array-wp-cache-phase2php/function.in-array?output_format=md)]: Wrong datatype for second argument in (my domain)/wp-content/plugins/wp-super- cache/wp-cache-phase2.php on line 78 ======================================== ===================== The ‘wp-content/wp-cache-config.php’ file however, shows this: * ============================= $cache_acceptable_files = array( ‘wp-comments- popup.php’, ‘wp-links-opml.php’, ‘wp-locations.php’ ); ====================== ========================== Any further thoughts on what the problem might be? * Plugin Author [Donncha O Caoimh (a11n)](https://wordpress.org/support/users/donncha/) * (@donncha) * [13 years, 7 months ago](https://wordpress.org/support/topic/plugin-wp-super-cache-php-warning-re-missing-array-wp-cache-phase2php/#post-2943660) * Still having problems? Did your host update PHP or install a PHP optimizer perhaps? * Otherwise dump $cache_acceptable_files to a file just before it’s supposed to be used, or even define it just before line 78. There’s something weird happening on your server 🙁 Viewing 6 replies - 1 through 6 (of 6 total) The topic ‘[Plugin: WP Super Cache] PHP Warning re missing array / wp-cache-phase2. php’ is closed to new replies. * ![](https://ps.w.org/wp-super-cache/assets/icon-256x256.png?rev=1095422) * [WP Super Cache](https://wordpress.org/plugins/wp-super-cache/) * [Frequently Asked Questions](https://wordpress.org/plugins/wp-super-cache/#faq) * [Support Threads](https://wordpress.org/support/plugin/wp-super-cache/) * [Active Topics](https://wordpress.org/support/plugin/wp-super-cache/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/wp-super-cache/unresolved/) * [Reviews](https://wordpress.org/support/plugin/wp-super-cache/reviews/) * 6 replies * 2 participants * Last reply from: [Donncha O Caoimh (a11n)](https://wordpress.org/support/users/donncha/) * Last activity: [13 years, 7 months ago](https://wordpress.org/support/topic/plugin-wp-super-cache-php-warning-re-missing-array-wp-cache-phase2php/#post-2943660) * Status: not resolved