Want to flush the Opcache instead of APC? Check out this article: How to clear PHP’s Opcache. PHP 5.5, PHP 5.6, and PHP 7 have opcode caching built into PHP and it is enabled by default. The package for APC is available in the base repository itself so we do not need to configure any additional repositories. This makes php execution faster than usual. APC provided both opcode caching (opcache) and object caching. APC is the alternative php cache that enables php to cache both user data and opcode. But from what I have read (I hope Im wrong), even if you create a pool per process, all sites accross all pools will share the same APC cache. PHP process manager allows multiple PHP processes to share a single APC cache. This tutorial is only relevant for PHP 5.4. APCu is the official replacement for the outdated APC extension. To get around this problem, we have been looking into PHP-FPM. In fact, you’re better of disabling APC altogether, as it produces overhead that never gives you the benefits. APC is an opcode cache that allows PHP to save and reuse the intermediate code generated from PHP source code as a speed optimization. There’s no need to clear the APC cache, as it gets invalidated on every new request – each request starts a new process. Not to be confused with running PHP as the PHP-FPM daemon, in the older days PHP was run as a FastCGI script. 19 Answers Sorted by: 146 You can use the PHP function apcclearcache. That probably means sending a kill signal to the PHP process and starting it anew. rootraspberrypi: apt-get install mysql-client mysql-server php5-mysql phpmyadmin. Install MySQL server and PHPMyAdmin if needed. rootraspberrypi: apt-get install nginx php5-fpm php-apc. If you start your PHP daemon via the built-in server, as php -S 127.0.0.1:80, you need to restart your daemon. Install NGINX, PHP-FPM and APC cache package. If this is how you’re running your PHP stack, you may consider using multiple PHP-FPM masters as outlined in “A better way to run PHP-FPM”, as it gives you an APC cache per PHP-FPM pool you are running. If your PHP server is running as a daemon via PHP-FPM, you can reload PHP-FPM. This can be used with Nginx, Lighttpd or even Apache. A restart is not needed (but it will also work), a reload is sufficient. Isnt the apc.userttl 0 supposed to keep the files cached until APC is restarted - and Stack Exchange Network Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. With Apache + mod_phpĪs PHP is run as an Apache module, it’s sufficient to reload the Apache service. This depends on the way you run your PHP application. To clear the system cache, the one that holds the byte-code of the PHP files (the so called “opcode” cache), just call apc_cache_clear() without options. To clear the user cache (key/value), you can use apc_cache_clear('user'). You can call the apc_clear_cache() function to clear the cache. To install this extension, SSH into your server as root and run the following commands: sudo apt-get install gcc make autoconf libc-dev pkg-config sudo pecl5.4-sp install apc. How do you clear the APC cache? There are basically two methods: as a PHP developer, you can use the built-in PHP functions – or as a SysAdmin, you can restart the necessary services to flush the APC cache. To enable APCs separate object caching functionality in PHP 5.5+, do not install APC.
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