Installing and configuring ZMQ:
The following exemples is based on Debian Linux but it should work in other OS.
First:
Installing 0MQ:
Go to http://zeromq.org/area:download and choose a package according your OS, in my case I've choosed
POSIX tarball Stable Release 4.0.4.
~$ tar -xvf zeromq-4.0.4.tar
~$ cd zeromq-4.0.4
~$ ./configure
~$ make
~$ sudo make install
Ok, we just have installed ZMQ now need install zmq php binding...
Make sure you having php-dev and php pear installed. If no:
~$ sudo apt-get install php5-dev php-pear
~$ sudo pecl install zmq-beta
Ok, we have now ZMQ and php binding (ext-php) installed but we should add "extension=zmq.so" (Or extension=php_zmq.dll on windows) to php.ini:
In my case:
~$ sudo nano /etc/php5/apache2/php.ini
**NOTE:** If PHP version is 5.4.x you will need to add a zmq.ini file in /etc/php5/conf.d and put "extension=zmq.so":
~$ sudo nano /etc/php5/conf.d/20-zmq.ini
Reloadind HTTP server (in my case apache):
~$ sudo service apache2 reload