PHP 7.2 memcached extension on Mac OS

Question

I am trying to setup php memcached extension on mac OS High Sierra. I am running php 7.2

Output of php -v:

PHP 7.2.6 (cli) (built: May 25 2018 06:18:43) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
    with Zend OPcache v7.2.6, Copyright (c) 1999-2018, by Zend Technologies

I installed memcached via pecl without any error:

pecl install memcached

It is enabled in php.ini file:

extension="memcached.so"

When I run <?php echo phpinfo();?> on my Apache server. I can see session configured:

session.save_handler    memcached   memcached

My symfony application gives me still this error:

(1/1) ClassNotFoundException
Attempted to load class "Memcached" from the global namespace.
Did you forget a "use" statement?

EDIT:

My apache is running a different version of php (PHP Version 7.1.16) I don't know why but I think this cannot be a problem.

In info file I can see in the CORE section that php extension dir is "/usr/local/lib/php/pecl/20170718". When I open that directory there is memcached.so file. The path is correct.

EDIT 2:

In my apache logs I see warning:

PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/lib/php/pecl/20170718/memcached.so' - dlopen(/usr/local/lib/php/pecl/20170718/memcached.so, 9): Symbol not found: _zend_empty_string\n  Referenced from: /usr/local/lib/php/pecl/20170718/memcached.so\n  Expected in: flat namespace\n in /usr/local/lib/php/pecl/20170718/memcached.so in Unknown on line 0

Answer 1

So. Apache and SLI php version use diferent php.ini files. For examle on my Debian 9 it use /etc/php/7.2/apache2/php.ini and /etc/php/7.2/cli/php.ini

I believe your problem is that you are using a different version of PHP.

Just try comands below:

$sudo a2dismod php7.1
$sudo a2enmod php7.2
$sudo service apache2 restart

If you still get same Error try create info.php in your www root dir thich conteint next code:

<?php
phpinfo();

And check Memcache are loaded.