Install php-apcu by entering the following commands in the terminal:
sudo apt update sudo apt install php-apcu
Description:
APC User Cache for PHP
The APCu is userland caching: APC (Alternative PHP Cache) stripped of opcode caching after the deployment of Zend OpCache in PHP 5.5 as the primary solution to opcode caching in future versions of PHP. . The APCu is a fast solution for userland caching (and dumping) of PHP variables locally, it is not distributed like MemcacheD, but they can be used together for optimal caching.
Homepage: https://pecl.php.net/package/APCu
Version: 5.1.9+4.0.11-1build1
Section: universe/php