Title: PHP8 Last modified: May 18, 2022 --- # PHP8 * Resolved [sgucci1](https://wordpress.org/support/users/sgucci1/) * (@sgucci1) * [4 years ago](https://wordpress.org/support/topic/php8-15/) * Your plugin works great with PHP7.4, but when I upgrade to PHP8, memcached doesn’t work. Does not show enabled in my WP admin, but when I switch back to PHP7.4, memcached shows enabled and works great. Viewing 15 replies - 1 through 15 (of 15 total) * Plugin Contributor [Andrija Vučinić](https://wordpress.org/support/users/aidvu/) * (@aidvu) * [4 years ago](https://wordpress.org/support/topic/php8-15/#post-15655785) * Hey there, * we’ve been running it on both 8.0 and 8.1 for a while now. That said, we use this extension [https://pecl.php.net/package/memcache](https://pecl.php.net/package/memcache)( as opposed to memcached, mind the last d). Could you give us some more info on your environment? Does php8 have the correct extensions? * Thread Starter [sgucci1](https://wordpress.org/support/users/sgucci1/) * (@sgucci1) * [4 years ago](https://wordpress.org/support/topic/php8-15/#post-15657921) * Hi, thank you for your help. Yes, i’m using both extensions, and both configured for php8. Here are my files: * object-cache * if ( ! defined( ‘WP_CACHE_KEY_SALT’ ) ) { define(‘WP_CACHE_KEY_SALT’, ‘tx4bISxTxZxxFxwPn6CxxqepUjuSxBxlxA1kxxxxxwxG6xGxxxLxCyxIHx3keSJG’);} * wp-config * define(‘WP_CACHE_KEY_SALT’, ‘tx4bISxTxZxxFxwPn6CxxqepUjuSxBxlxA1kxxxxxwxG6xGxxxLxCyxIHx3keSJG’); * Plugin Contributor [Andrija Vučinić](https://wordpress.org/support/users/aidvu/) * (@aidvu) * [4 years ago](https://wordpress.org/support/topic/php8-15/#post-15659530) * Don’t think it’s a configuration issue. If it works fine on 7.4, I’m guessing you’re using an outdated version of the plugin (no php8+ support). * Could you run this on your server and paste the output: `php -v && php -m | grep memcache` * Thread Starter [sgucci1](https://wordpress.org/support/users/sgucci1/) * (@sgucci1) * [4 years ago](https://wordpress.org/support/topic/php8-15/#post-15661004) * Here is the output from the command that you provided me * [root@node1467 ~]# php -v && php -m | grep memcache bash: syntax error near unexpected token `;&’ [root@node1467 ~]# * Plugin Contributor [Andrija Vučinić](https://wordpress.org/support/users/aidvu/) * (@aidvu) * [4 years ago](https://wordpress.org/support/topic/php8-15/#post-15661349) * Heh, that didn’t work. Let’s just run them as separate commands: * `php -v` * And * `php -m | grep memcache` * Thread Starter [sgucci1](https://wordpress.org/support/users/sgucci1/) * (@sgucci1) * [4 years ago](https://wordpress.org/support/topic/php8-15/#post-15661391) * Here is the output (I did go back to PHP 7.3 while were troubleshooting): * [root@node1467 ~]# php -v PHP 7.3.33 (cli) (built: May 18 2022 00:28:21) ( NTS) Copyright (c) 1997-2018 The PHP Group Zend Engine v3.3.33, Copyright (c) 1998- 2018 Zend Technologies with Zend OPcache v7.3.33, Copyright (c) 1999-2018, by Zend Technologies [root@node1467 ~]# * [root@node1467 ~]# php -m | grep memcache memcache memcached [root@node1467 ~]# * > [https://prnt.sc/jiLL-W01yce8](https://prnt.sc/jiLL-W01yce8) * Plugin Contributor [Andrija Vučinić](https://wordpress.org/support/users/aidvu/) * (@aidvu) * [4 years ago](https://wordpress.org/support/topic/php8-15/#post-15661566) * Could you please do the same while on php 8.0? Trying to figure what is missing. Still think it might be old extension versions. * Btw. How did you install the extensions? Pecl? * Thread Starter [sgucci1](https://wordpress.org/support/users/sgucci1/) * (@sgucci1) * [4 years ago](https://wordpress.org/support/topic/php8-15/#post-15661953) * Okay, this is on our test site. When using your code and running PHP8, our test site throws an error (below that are the results of the commands you asked for): * There has been a critical error on this website. * ``` [its420somewhere@node1467 test.its420somewhere.com]$ php -v PHP 8.0.19 (cli) (built: May 18 2022 03:36:01) ( NTS ) Copyright (c) The PHP Group Zend Engine v4.0.19, Copyright (c) Zend Technologies with Zend OPcache v8.0.19, Copyright (c), by Zend Technologies [its420somewhere@node1467 test.its420somewhere.com]$ php -m | grep memcache memcached ``` * Plugin Contributor [Andrija Vučinić](https://wordpress.org/support/users/aidvu/) * (@aidvu) * [4 years ago](https://wordpress.org/support/topic/php8-15/#post-15663473) * Ah, ok. You need to have `memcache` installed, not `memcached`. Check the output for PHP 7.3. * Thread Starter [sgucci1](https://wordpress.org/support/users/sgucci1/) * (@sgucci1) * [4 years ago](https://wordpress.org/support/topic/php8-15/#post-15664417) * Just to be clear, don’t both of them need to be installed per your install instructions? * Plugin Contributor [Andrija Vučinić](https://wordpress.org/support/users/aidvu/) * (@aidvu) * [4 years ago](https://wordpress.org/support/topic/php8-15/#post-15664554) * > Just to be clear, don’t both of them need to be installed per your install > instructions? * It can be confusing. The `memcached` we mention is the cache store server: [https://memcached.org/](https://memcached.org/). It is unrelated to PHP. * For PHP, there are two extensions. `memcache` and `memcached`. They are both extensions that allow PHP to communicate with the above mentioned cache store server. This plugin is developed specifically for the `memcache` extension. * Hope that helps. * Thread Starter [sgucci1](https://wordpress.org/support/users/sgucci1/) * (@sgucci1) * [4 years ago](https://wordpress.org/support/topic/php8-15/#post-15664663) * Okay, my host installed it, even though they told it was installed before. They did add this note, any thoughts? I’m not an expert, just trying to understand. * ``` [root@node1467 ~]# php -m | grep memcache memcache memcached Still, I'd like to add that memcache is a bit outdated, so if memcached works well with your project(s), I'd recommend using it instead. ``` * Plugin Contributor [Andrija Vučinić](https://wordpress.org/support/users/aidvu/) * (@aidvu) * [4 years ago](https://wordpress.org/support/topic/php8-15/#post-15665017) * They just looked at the release dates. `memcache` is fine, and works well (running it on a lot of sites). * But the most important question is, does it work now with PHP 8.0? * Thread Starter [sgucci1](https://wordpress.org/support/users/sgucci1/) * (@sgucci1) * [4 years ago](https://wordpress.org/support/topic/php8-15/#post-15665025) * Yes, it’s working fine on my live and test site now with PHP8. * Thanks for all your help. * Steve * Plugin Contributor [Andrija Vučinić](https://wordpress.org/support/users/aidvu/) * (@aidvu) * [4 years ago](https://wordpress.org/support/topic/php8-15/#post-15665099) * Nice, glad to hear it! Viewing 15 replies - 1 through 15 (of 15 total) The topic ‘PHP8’ is closed to new replies. * ![](https://s.w.org/plugins/geopattern-icon/memcached.svg) * [Memcached Object Cache](https://wordpress.org/plugins/memcached/) * [Frequently Asked Questions](https://wordpress.org/plugins/memcached/#faq) * [Support Threads](https://wordpress.org/support/plugin/memcached/) * [Active Topics](https://wordpress.org/support/plugin/memcached/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/memcached/unresolved/) * [Reviews](https://wordpress.org/support/plugin/memcached/reviews/) * 15 replies * 2 participants * Last reply from: [Andrija Vučinić](https://wordpress.org/support/users/aidvu/) * Last activity: [4 years ago](https://wordpress.org/support/topic/php8-15/#post-15665099) * Status: resolved