Execute the command below to install an extension for the native PHP version:
CentOS
yum install <package name>
Debian
apt install <package name>
You can install an extension for the alternative PHP version:
Extension installation example:
CentOS
yum install autoconf gcc zlib-devel
Debian
apt install autoconf gcc zlib1g-dev
/opt/<PHP version directory>/bin/pecl install <extension name>
echo extension=<extension name> >> /opt/<PHP version directory>/etc/php.d/<extension name>.ini
For example: echo extension=memcache.so >> /opt/<PHP version directory>/etc/php.d/<extension name>.ini
Let's install env as an example::
cd /tmp
wget -O env.tar.gz http://pecl.php.net/get/env
tar xzvf env.tar.gz
cd env-0.2.1/
/opt/<version directory PHP>/bin/phpize
./configure --with-php-config=/opt/<PHP version directory>/bin/php-config && make && make install
echo 'extension=env.so' > /opt/<PHP version directory>/etc/php.d/20-env.ini