I installed the libevent-dev library on my Debian 7 64bit desktop:
$ sudo aptitude install -y libevent-dev
Then I installed the PECL library
$ pecl list
Installed packages, channel pecl.php.net:
=========================================
Package Version State
libevent 0.1.0 beta
I've restarted PHP and the OS but PHP doesn't list libevent as an installed ext in with phpinfo() and I get "PHP Fatal error: Call to undefined function event_base_new()" when I try to use it.
How do you install Libevent?
Add extension=libevent.so to php.ini.
I've successfully installed it. These are the steps:
apt-get install libevent-dev
sudo pecl install libevent
Edit: Press enter when you are asked for the libevent installation directory (autodetect)
; Add extension=libevent.so in the *.ini file where you desire to load it. For example if you want this extension to be loaded always, create a libevent.ini file where your php5 mods are (in my computer they are in /etc/php5/mods-available/) and write extension=libevent.so. Enable this module then with php5enmod libevent. This page may help you.
Install Libevent for PHP 5.X
sudo apt-get install libevent-dev
sudo pecl install libevent-beta
sudo su
sudo echo 'extension=libevent.so' > /etc/php5/mods-available/libevent.ini
exit
sudo ln -s /etc/php5/mods-available/libevent.ini /etc/php5/fpm/conf.d/
sudo ln -s /etc/php5/mods-available/libevent.ini /etc/php5/cli/conf.d/
sudo service php5-fpm restart
Install Libevent for PHP 7.X
At this time pecl package libevent is not available for php 7
https://pecl.php.net/package/libevent
So let's compile it.
Download master: https://github.com/expressif/pecl-event-libevent
Unpack to: /tmp/install_libevent
cd /tmp/install_libevent/pecl-event-libevent-master
sudo phpize
sudo ./configure
After this step scroll our console window and try find any Warnings or Errors. I got one warning - required to install re2c package.
sudo make
sudo make install
sudo su
sudo echo 'extension=libevent.so' > /etc/php/7.0/mods-available/libevent.ini
exit
sudo ln -s /etc/php/7.0/mods-available/libevent.ini /etc/php/7.0/fpm/conf.d/20-libevent.ini
sudo ln -s /etc/php/7.0/mods-available/libevent.ini /etc/php/7.0/cli/conf.d/20-libevent.ini
sudo service php7.0-fpm restart