ubuntu-php5.6-zts-pthreads

##############################################################################
# INSTALL isolated PHP 5.6 ZTS (Thread-safe) with pthreads on Ubuntu 14.04 ###
##############################################################################

1) Install necessary bison version

  wget http://launchpadlibrarian.net/140087283/libbison-dev_2.7.1.dfsg-1_amd64.deb
  wget http://launchpadlibrarian.net/140087282/bison_2.7.1.dfsg-1_amd64.deb
  dpkg -i libbison-dev_2.7.1.dfsg-1_amd64.deb
  dpkg -i bison_2.7.1.dfsg-1_amd64.deb


2) Download PHP

  cd /usr/src
  git clone https://github.com/php/php-src
  cd php-src


2.a) Optionally check out speicific branch

  git checkout PHP-5.6


3) Download pthreads

  cd ext
  git clone https://github.com/krakjoe/pthreads
  cd ../


4) Compile

  ./buildconf --force
  ./configure --prefix=/opt/php-zts --with-config-file-path=/opt/php-zts/etc --enable-maintainer-zts --with-apxs2=/usr/bin/apxs --with-mysql --with-mysqli --enable-pthreads --enable-mbstring
  make -j8
  make install
  echo "extension=pthreads.so" > /opt/php-zts/modules.d/pthreads.ini


5) Symlinking

  ln -s /opt/php-zts/bin/php /usr/local/bin/php-zts
  ln -s /opt/php-zts/bin/phpize /usr/local/bin/phpize-zts
  ln -s /opt/php-zts/bin/php-config /usr/local/bin/php-config-zts
  ln -s /opt/php-zts/bin/php-cgi /usr/local/bin/php-cgi-zts
  ln -s /opt/php-zts/bin/phpdbg /usr/local/bin/phpdbg-zts


###################
# BUILD MODULES ###
###################

  cd /usr/src
  git clone https://github.com/krakjoe/acpu
  cd apcu
  phpize-zts
  ./configure --with-php-config=php-config-zts
  make -j8
  make install
  echo "extension=apcu.so" > /opt/php-zts/modules.d/apcu.ini





-- http://stackoverflow.com/questions/18033191/how-to-install-pthread-in-ubuntu-12-10

Hello.

I had a few issues with your commands:

1. With the 5.6 version of php, the compilation failed because the "Zend/zend_inheritance.h" file was missing. I solved it by switching to the version 7.x.
2. There is a typo: git clone https://github.com/krakjoe/apcu and not apcu.

Finally, the thread works properly.
I have a question though: how to tell apache to use this version of php? I suppose installing the package libapache2-mod-php5 won't work?

Edit: My bad, the procedure already binds this version of php. However, I have an other issue: Apache doesn't interprets php at all, and I have this error in CGI:

root@machine:/var/www/html# php-cgi-zts test.php 
PHP Fatal error:  The cgi-fcgi SAPI is not supported by pthreads in Unknown on line 0
PHP Fatal error:  Unable to start pthreads module in Unknown on line 0