For Wampp (Windows)-----------------------------------------------------------------------------------1.  Find out what is your 'PHP Extension Build' version by using phpinfo(). You can use this - http://localhost/?phpinfo=12.  Download the pthreads that matches your php version (32 bit or 64 bit) and php extension build (currently used VC11). Use this link for download - http://windows.php.net/downloads/pecl/releases/pthreads/ 3.  Extract the zip -      Move php_pthreads.dll to the 'bin\php\ext\' directory.      Move pthreadVC2.dll to the 'bin\php\' directory.      Move pthreadVC2.dll to the 'bin\apache\bin' directory.      Move pthreadVC2.dll to the 'C:\windows\system32' directory.4.  Open php\php.ini and add      extension=php_pthreads.dllNow restart server and you are done. Thanks.

Here is how I got it working under Linux Ubuntu distro - WITHOUT USE PECL:We will download both, PHP and Pthread without PECL1 - Get PHP versionFor this example we will use version: 5.4.36# wget http://www.php.net/distributions/php-5.4.36.tar.gz2- Get Pthreads version:I'm using an old version but, you could take any one# wget http://pecl.php.net/get/pthreads-1.0.0.tgzExtract both, php and pthreads versions#tar zxvf php-5.4.36.tar.gz#tar zxvf pthreads-1.0.0.tgz 3- Move Pthreads to php/ext folder. Inside version of PHP downloaded at item 1.4- Reconfigure sources# ./buildconf --force# ./configure --help | grep pthreadsYou have to see --enable-pthreads listed. If do not, clear the buidls with this commands:# rm -rf aclocal.m4# rm -rf autom4te.cache/# ./buildconf --force5 - Inside php folder run configure command to set what we need:# ./configure --enable-debug --enable-maintainer-zts --enable-pthreads --prefix=/usr --with-config-file-path=/etc6 - Install PHPWe will run make clear just to be sure that no other crashed build will mess our new one.# make clear # make# make install7 - Copy configuration file of PHP and add local lib to include path# cp php.ini-development /etc/php.iniEdit php.ini and set Include_path to be like this:Include_path = “/usr/local/lib/php”9 - Check Modules# php -m (check pthread loaded)You have to see pthreads listed10 - If pthread is not listed, update php.ini# echo "extension=pthreads.so" >> /etc/php.ini

On Windows the installation is as follows:Download the pthreads that matches your php version.I found mine at: http://windows.php.net/downloads/pecl/releases/pthreads/(I used version 0.44 wich is the newest at the time of writing this, and then downloaded the one for php 5.3 which is the version I am using).Extract the zip.Move php_pthreads.dll to the php\ext\ directory.Move pthreadVC2.dll to the php\ directory.Open php\php.ini and addextension=php_pthreads.dllYou are done.

I haven't found any proper instructions on how to install pthreads in linux, so I'll leave the steps I followed:# Required librariessudo apt-get install gcc make libzzip-dev libreadline-dev libxml2-dev \libssl-dev libmcrypt-dev libcurl4-openssl-dev lib32bz2-dev # Download PHPcd /usr/local/srcwget http://www.php.net/distributions/php-<version>.tar.gz( e.g. wget http://www.php.net/distributions/php-5.5.8.tar.gz )# Extracttar zxvf php-<version>.tar.gz(e.g. tar zxvf php-5.5.8.tar.gz )# Configurecd /usr/local/src/php-<version>( e.g. cd /usr/local/src/php-5.5.8 )./configure --prefix=/usr --with-config-file-path=/etc --enable-maintainer-zts# Compilemake && make install( make -j3 && make -j3 install) -> Faster building# Copy configurationcp php.ini-development /etc/php.ini# Install pthreadspecl install pthreadsecho "extension=pthreads.so" >> /etc/php.ini# Check installationphp -m | grep pthreads

Sadly, this extension seems to be in poor repair. After spending a few hours trying to get it to fly on Fedora 32 with PHP 7.4, I noticed that it's not really maintained since about 2016. Attempting to compile it with PHP 7.4 results in screens full of nasty compile errors.

HOW TO INSTALL IN LINUX SYSTEM'S:------------------------------------1) Download PHP sources and Unpack PHP2) Download PEAR     wget http://pear.php.net/go-pear.phar     php go-pear.phar3) Download pthreadsGet PECL extension (PECL is a repository for PHP Extensions)# pecl install pthread-0.4.44) Unpack pthreadscopy pthread-0.4.4  to  php/ext(for ./configure allow  add option --enable-pthreads)# mv build/php-src-master/ext/pthreads-master    build/php-src-master/ext/pthreads5)  Reconfigure sources# ./buildconf --force# ./configure --help | grep pthreadsYou should see the appropriate --enable-pthreads option listed as a result, if you do not, then# rm -rf aclocal.m4# rm -rf autom4te.cache/# ./buildconf --force6) Build PHPCompile PHP source codeAdd:# ./configure --enable-debug --enable-maintainer-zts --enable-pthreads7) Installing PHP# make# sudo make install8) Update php.iniAdd in php.iniextension=pthreads.soInclude_path = “/usr/local/lib/php”9) Check Modulesphp -m (check pthread loaded)10) Test Thread Class# php SimpleTest.php

I haven't found any proper instructions on how to install pthreads in linux, so I'll leave the steps I followed:# Required librariessudo apt-get install gcc make libzzip-dev libreadline-dev libxml2-dev \libssl-dev libmcrypt-dev libcurl4-openssl-dev lib32bz2-dev # Download PHPcd /usr/local/srcwget http://www.php.net/distributions/php-<version>.tar.gz( e.g. wget http://www.php.net/distributions/php-5.5.8.tar.gz )# Extracttar zxvf php-<version>.tar.gz(e.g. tar zxvf php-5.5.8.tar.gz )# Configurecd /usr/local/src/php-<version>( e.g. cd /usr/local/src/php-5.5.8 )./configure --prefix=/usr --with-config-file-path=/etc --enable-maintainer-zts# Compilemake && make install( make -j3 && make -j3 install) -> Faster building# Copy configurationcp php.ini-development /etc/php.ini# Install pthreadspecl install pthreadsecho "extension=pthreads.so" >> /etc/php.ini# Check installationphp -m | grep pthreads

They can still be used in web server if used with exec('php script.php') and php-cli.ini .

To compile PHP 7.2 with pthreads on Ubuntu 16.04 or Ubuntu 18.04 or Debian 9 Stretch, use this bash file at https://gist.github.com/agnelvishal/24f42c65af2f6cace1e9387617a0182a

Also, possible by phpbrew1. phpbrew install php-5.5.30 -- --enable-maintainer-zts2. phpbrew use php-5.5.303. phpbrew ext install pthreads 2.0.10