Yii2 Exception: ApcCache requires PHP apc extension to be loaded

问题

I receive the exception when configure the cache components in main configuration of advanced-template frontend, on my php.ini the extension rsults enabled, how I can fix this problem? frontend/config/main.php:

'cache' => [
    'class' => 'yii\caching\ApcCache',
    'keyPrefix' => 'myapp',       // a unique cache key prefix
],

The phpinfo() about apcu:

回答1:

Solved by updating the configuration as follow:

'cache' => [
    'class' => 'yii\caching\ApcCache',
    'keyPrefix' => 'myapp',       // a unique cache key prefix
    'useApcu' => true,
],

The php version is the 7.0.18 and, as I can learn, this version use only apcu and not the apc like php 5.X

回答2:

APC and APCu are diffrent extensions. To make it work, you have to install APC, in linux:

sudo apt-get install php-apc
sudo /etc/init.d/apache2 restart

回答3:

This fix worked for me. The only fix that worked is to explicitly change

public $useApcu = false;

in the ApcCache class to

public $useApcu = true;

来源：https://stackoverflow.com/questions/45460796/yii2-exception-apccache-requires-php-apc-extension-to-be-loaded