Title: Warning with HHVM Last modified: August 21, 2016 --- # Warning with HHVM * [PKeidel](https://wordpress.org/support/users/pkeidel/) * (@pkeidel) * [11 years, 10 months ago](https://wordpress.org/support/topic/warning-with-hhvm/) * Hello guys, * can you please help me? I’m using your plugin on a page ([http://xn--jr-wstensachsen-2vb.de](http://xn--jr-wstensachsen-2vb.de)) with nginx and hhvm (HipHop VM 3.1.0). Sometimes I get in trouble with your plugin and the page keeps blank. * In hhvm/error.log is the following message shown: Warning: Parameter 1 to W3_Plugin_TotalCache:: ob_callback() expected to be a reference, value given in /var/www/xn--jr-wstensachsen- 2vb.de/wp-includes/functions.php on line 2935 * Does anybody has an idea whats going on there and how to fix this? * Thanks a ton, PKeidel * [https://wordpress.org/plugins/w3-total-cache/](https://wordpress.org/plugins/w3-total-cache/) Viewing 15 replies - 1 through 15 (of 18 total) 1 [2](https://wordpress.org/support/topic/warning-with-hhvm/page/2/?output_format=md) [→](https://wordpress.org/support/topic/warning-with-hhvm/page/2/?output_format=md) * Thread Starter [PKeidel](https://wordpress.org/support/users/pkeidel/) * (@pkeidel) * [11 years, 10 months ago](https://wordpress.org/support/topic/warning-with-hhvm/#post-5061279) * Does anyone has an answer for that problem? Here is a stacktrace: * ``` [Mon Jul 14 19:29:47 2014] [hphp] [1725:7fcaf33ff700:5:000001] [] \nWarning: Parameter 1 to W3_Plugin_TotalCache::ob_callback() expected to be a reference, value given in /var/www/xn--jr-wstensachsen-2vb.de/wp-includes/functions.php on line 2935 #0 wp_ob_end_flush_all(), called at [/var/www/xn--jr-wstensachsen-2vb.de/wp-includes/plugin.php:470] #1 do_action(), called at [/var/www/xn--jr-wstensachsen-2vb.de/wp-includes/load.php:573] #2 shutdown_action_hook(), called at [:0] #0 at [/var/www/xn--jr-wstensachsen-2vb.de/wp-includes/functions.php:2935] #1 wp_ob_end_flush_all(), called at [/var/www/xn--jr-wstensachsen-2vb.de/wp-includes/plugin.php:470] #2 do_action(), called at [/var/www/xn--jr-wstensachsen-2vb.de/wp-includes/load.php:573] #3 shutdown_action_hook(), called at [:0] ``` * [fatpat76](https://wordpress.org/support/users/fatpat76/) * (@fatpat76) * [11 years, 8 months ago](https://wordpress.org/support/topic/warning-with-hhvm/#post-5061340) * I also see the same in my HHVM error log. * HipHop VM 3.2.0 (rel) nginx version: nginx/1.7.5 built by gcc 4.8.2 (Ubuntu 4.8.2-19ubuntu1) * Wordress 4.0 W3TC Version 0.9.4 * [Willie Jackson](https://wordpress.org/support/users/williejackson/) * (@williejackson) * [11 years, 8 months ago](https://wordpress.org/support/topic/warning-with-hhvm/#post-5061341) * Please [email us](https://www.w3-edge.com/contact/). * [war59312](https://wordpress.org/support/users/war59312/) * (@war59312) * [11 years, 7 months ago](https://wordpress.org/support/topic/warning-with-hhvm/#post-5061344) * Same here and HHVM is crashing. 🙁 * [war59312](https://wordpress.org/support/users/war59312/) * (@war59312) * [11 years, 7 months ago](https://wordpress.org/support/topic/warning-with-hhvm/#post-5061345) * See reported issue at [https://github.com/facebook/hhvm/issues/3876](https://github.com/facebook/hhvm/issues/3876) * So we can get this fixed. * [Willie Jackson](https://wordpress.org/support/users/williejackson/) * (@williejackson) * [11 years, 7 months ago](https://wordpress.org/support/topic/warning-with-hhvm/#post-5061346) * Thanks for bringing this to our attention, we took a look and verified the issue being reported. A fix will be in the forthcoming release. * [war59312](https://wordpress.org/support/users/war59312/) * (@war59312) * [11 years, 7 months ago](https://wordpress.org/support/topic/warning-with-hhvm/#post-5061347) * Thanks! 😀 * [Till Krüss](https://wordpress.org/support/users/tillkruess/) * (@tillkruess) * [11 years, 7 months ago](https://wordpress.org/support/topic/warning-with-hhvm/#post-5061349) * Same issue here. Nginx & PHP5-FPM works flawless. When I use HHVM 3.2.0 I get the following error: * ``` Warning: Parameter 1 to W3_Plugin_TotalCache::ob_callback() expected to be a reference, value given in /wp-includes/functions.php on line 3092 ``` * [Willie Jackson](https://wordpress.org/support/users/williejackson/) * (@williejackson) * [11 years, 7 months ago](https://wordpress.org/support/topic/warning-with-hhvm/#post-5061350) * @[Till Krüss](https://wordpress.org/support/topic/warning-with-hhvm?replies=9#post-6121500): as mentioned above, this has been addressed in the next release. * [Till Krüss](https://wordpress.org/support/users/tillkruess/) * (@tillkruess) * [11 years, 7 months ago](https://wordpress.org/support/topic/warning-with-hhvm/#post-5061351) * Awesome, thanks! * [Prakash](https://wordpress.org/support/users/ankitpr89/) * (@ankitpr89) * [11 years, 6 months ago](https://wordpress.org/support/topic/warning-with-hhvm/#post-5061366) * Even we are having the same issue. * Waiting for next W3 Total Cache Plugin release. Thanks for the update Willie 🙂 * [Prakash](https://wordpress.org/support/users/ankitpr89/) * (@ankitpr89) * [11 years, 5 months ago](https://wordpress.org/support/topic/warning-with-hhvm/#post-5061371) * [@willie](https://wordpress.org/support/users/willie/) Jackson I have update W3 total plugin, but again we are getting same warning messages. Has these issues been fixed? * > E_WARNING: Parameter 1 to W3_Plugin_TotalCache::ob_callback() expected to be > a reference, value given > 1 File “/var/www/path/wp-includes/functions.php” > line 3092 in wp_ob_end_flush_all 2 File “/var/www/path/wp-includes/plugin.php” > line 505 in do_action 3 File “/var/www/path/wp-includes/load.php” line 613 > in shutdown_action_hook 4 File “” line 0 in
* [gadelkareem](https://wordpress.org/support/users/gadelkareem/) * (@gadelkareem) * [11 years, 4 months ago](https://wordpress.org/support/topic/warning-with-hhvm/#post-5061377) * Here is an easy fix [https://github.com/crowdfavorite-mirrors/wp-w3-total-cache/pull/1](https://github.com/crowdfavorite-mirrors/wp-w3-total-cache/pull/1) * [Daniel](https://wordpress.org/support/users/gabu69/) * (@gabu69) * [11 years, 4 months ago](https://wordpress.org/support/topic/warning-with-hhvm/#post-5061378) * Gadelkareem * In which file should we mod this code? * thanks * [Daniel](https://wordpress.org/support/users/gabu69/) * (@gabu69) * [11 years, 4 months ago](https://wordpress.org/support/topic/warning-with-hhvm/#post-5061379) * Im getting as well this warnings: * \nFatal error: Class undefined: W3_Plugin_TotalCache in /public_html/wp-content/ plugins/w3-total-cache/inc/define.php on line 1461 * \nFatal error: unknown class W3_Plugin in /public_html/wp-content/plugins/w3- total-cache/lib/W3/Plugin/TotalCache.php on line 15 * \nFatal error: Class undefined: W3_Cache_Apc in /public_html/wp-content/plugins/ w3-total-cache/lib/W3/Cache.php on line 47 * \nWarning: Parameter 1 to W3_Plugin_TotalCache::ob_callback() expected to be a reference, value given in /public_html/wp-includes/functions.php on line 3269 * any ideas? Viewing 15 replies - 1 through 15 (of 18 total) 1 [2](https://wordpress.org/support/topic/warning-with-hhvm/page/2/?output_format=md) [→](https://wordpress.org/support/topic/warning-with-hhvm/page/2/?output_format=md) The topic ‘Warning with HHVM’ is closed to new replies. * ![](https://ps.w.org/w3-total-cache/assets/icon-256x256.png?rev=1041806) * [W3 Total Cache](https://wordpress.org/plugins/w3-total-cache/) * [Frequently Asked Questions](https://wordpress.org/plugins/w3-total-cache/#faq) * [Support Threads](https://wordpress.org/support/plugin/w3-total-cache/) * [Active Topics](https://wordpress.org/support/plugin/w3-total-cache/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/w3-total-cache/unresolved/) * [Reviews](https://wordpress.org/support/plugin/w3-total-cache/reviews/) * 18 replies * 10 participants * Last reply from: [BrentNewland](https://wordpress.org/support/users/brentnewland/) * Last activity: [11 years ago](https://wordpress.org/support/topic/warning-with-hhvm/page/2/#post-5061383) * Status: not resolved