BECOM SUDO USER:

sudo -s

INSTALL WEBSTATIC REPO FOR CENTOS/RED HAT 7:

rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm

INSTALL PHP WITH COMMON MODULES:

yum --nogp install -y --enablerepo=webtatic-testing \
php72w php72w-cli php72w-common php72w-devel \
php72w-gd php72w-intl php72w-mbstring php72w-mcrypt \
php72w-mysqlnd php72w-odbc php72w-opcache php72w-pdo \
php72w-pdo_dblib php72w-pear php72w-pgsql php72w-pspell \
php72w-soap php72w-xml php72w-xmlrpc php72w-bcmath

CHANGE TO A TEMP DIRECTORY:

cd /tmp

PULL DOWN the PTHREADS GIT REPO:

git clone https://github.com/krakjoe/pthreads.git
cd pthreads
zts-phpize
./configure --with-php-config=/usr/bin/zts-php-config
make

COPY EXTENSION TO PHP-ZTS MODULES FOLDER:

cp modules/pthreads.so /usr/lib64/php-zts/modules/.

ENABLE EXTENSION IN PHP-ZTS, BY CREATING A FILE:

vi /etc/php-zts.d/pthreads.ini

ADD THIS TO THE FILE AND SAVE:

extension=pthreads.so

NEXT CHECK TO SEE IF YOU GOT IT WORKING:

zts-php -i | grep -i thread

IT SHOULD OUPUT SOMETHING LIKE THIS:

/etc/php-zts.d/pthreads.ini
Thread Safety => enabled
pthreads

NOW YOU CAN INVOKE PROGRAMS THAT NEED THREADING AND PTHREADS BY USING:

zts-php (instead of php)

Adapted from: https://io.ofbeaton.com/2015/02/pthreads-phpzts-rpms-centos/