如何在 Laravel 5.7 中使用 Memcached 进行会话？

Question

Normally I used file as driver to store session and cache. Now I want to work with Memcached to store session and cache on Laravel 5.7 application. It is new to me. I have already installed php-memcached on my local environment.

In my Laravel 5.7 web application I have configured session.driver and cache.default in the .env file as following.

SESSION_DRIVER=memcached
CACHE_DRIVER=memcached

I leave everything else with its default installation. When I refresh the page I get the following error.

Symfony \ Component \ Debug \ Exception \ FatalThrowableError (E_ERROR)
Class 'Memcached' not found
/vendor/laravel/framework/src/Illuminate/Cache/MemcachedConnector.php 69

I do understand that when you configure driver for session and cache config to use Memcached , the MemcachedConnector will get involved. It imports the Memcached class and tries to create an instance object of the Memcached class as following.

use Memcached;

class MemcachedConnector {
    protected function createMemcachedInstance($connectionId) {
        return empty($connectionId) ? new Memcached : new Memcached($connectionId);
    }
}

With the above error, it seems like the Memcached class is missing. How can I solve it? Please do not tell me to do the following even it solves the problem.

SESSION_DRIVER=file
CACHE_DRIVER=file

or

SESSION_DRIVER=array
CACHE_DRIVER=array

Because I would like to use Memcached and would like to know what to do to make it work.

Answer 1

I can't comment yet so sorry for posting as answer.

Try running php -i || grep 'memcached' php -i || grep 'memcached' from your app directory.

If you're running vagrant, try vagrant ssh then php -i || grep 'memcached' php -i || grep 'memcached'

You could also (as suggested below) add phpinfo(); to the top of your routes/web.php (underneath the <? ) and that should spit out your php info when you try to load your site in the browser.

This will clue you up as to whether or not memcached is installed and loaded or not.