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I have an Ubuntu machine with nginx and memcache running, and I'm trying to use PHP with Memcached. I'm getting Fatal error: Class 'Memcached' not found.

The ini file is loaded from /etc/php5/fpm/php.ini, and all other additional .ini files are parsed, except memcached.ini (even after restarting nginx) as seen in phpinfo()'s output.

output for phpinfo()

I tried apt-get install php5-memcache and it completed without errors. However, pecl install memcached fails with the below error:

In file included from /tmp/pear/temp/memcached/php_memcached.h:22:0,
                 from /tmp/pear/temp/memcached/php_memcached.c:47:
/tmp/pear/temp/memcached/php_libmemcached_compat.h:5:40: fatal error: libmemcached-1.0/memcached.h: No such file or directory
compilation terminated.
make: *** [php_memcached.lo] Error 1
ERROR: `make' failed

The server has libmemcache in /usr/include/libmemcached, but even pecl install with --with-libmemcache=/usr/include/libmemcached fails.

The output for php -i | grep -i memcache is as below:

memcached support => enabled
libmemcached version => 0.44
Registered save handlers => files user memcached 
PWD => /usr/include/libmemcached
_SERVER["PWD"] => /usr/include/libmemcached

I'm not sure what else to check. Much appreciated if someone could help me out with something to fix this.


[UPDATE] Memcached is working from cli.

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up vote 1 down vote accepted

I solved the issue. The only thing I had to do was restart php5-fpm
sudo service php5-fpm restart.

Found this in -

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What is the output of

php -i |grep memcache

I've used memcache for storing php sessions as well as Magento Cache & Sessions.

There are two things not to be confused with:

  1. Memcached -> Note the 'd' which is a daemon listens on port no: 11211. It can be used to store php sessions instead of file system etc..

  2. Memcache -> a module usually not compiled with php. it's used when you want to store your php sessions in memcached.

so if php -i |grep memcache shows you have memcache installed. Then you need to install memcached (daemon) to be able to use/send sessions to it.

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I have installed Memcached, and not Memcache - adding the output for php -i | grep -i memcache to my question. But again, the ini loaded here is from php5/cli/ and for nginx is from php5/fpm/. I am not sure if it really matters, because the conf.d is the same. – shyam Jan 7 '14 at 10:34

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