How do I install the PHP Redis Extension for PHP 7.2?

I haven't personally tried this myself but I did find a few links that may be able to assist you with getting this installed on your server.

• https://serverpilot.io/docs/how-to-install-the-php-redis-extension/
  https://tecadmin.net/install-redis-centos/
  https://stackoverflow.com/questions/46955555/how-to-install-redis-extension-for-php-7

If you are using Debian or Ubuntu, you can simply do:

apt-get install php-redis

-- sw

Hi, Thanks for your suggestions.

I have installed the PHP Redis extension for PHP 5.6 and PHP 7.2 version. The issue is that the extension does not load up for PHP 7.2 when I check phpinfo but for PHP 5.6 it shows up in phpinfo.

I have confirmed the installation by using the below command

**for php 7.2 : **
[root@li2095-109 php.d]# php72 -m |grep redis
redis

**for php 5.6 : **
[root@li2095-109 php.d]# php -m |grep redis
PHP Warning: Module 'redis' already loaded in Unknown on line 0
redis

Can you suggest the exact steps for installing it for both the PHP version correctly?

WARNING! The following assumes you are using Debian/Ubuntu.

WARNING! WARNING! WARNING! You can seriously mess up your system doing all this. I take no responsibility for your actions.

You need to make sure that PHP is loading the PHP/redis interface shared library.

• Make sure the shared library is installed properly

stevewi@bill:~$ sudo find / -name igbinary.so
/usr/lib/php/<someversion>/igbinary.so
stevewi@bill:~$ sudo find / -name redis.so
/usr/lib/php/<someversion>/redis.so

n.b., you may have more than one…one for PHP5.6 and one for PHP7.2. They will be distinguished by <someversion>. You interpret <someversion> using the format YYYYjj.mm, where:

YYYY is a year
jj is the major revision (07)
mm is the minor revision (2x)

• Next, you have to make sure the PHP configuration for the shared libraries exists:

stevewi@bill:~$ ls /etc/php/7.2/mods-available/redis.ini
/etc/php/7.2/mods-available/redis.ini
stevewi@bill:~$ ls /etc/php/7.2/mods-available/igbinary.ini
/etc/php/7.2/mods-available/igbinary.ini

• If that's ok, you need to make sure the library is loaded by PHP7.2. You should have the following:

stevewi@bill:~$ cd /etc/php/7.2
stevewi@bill:/etc/php/7.2$ find . -name *igbinary* 
./cli/conf.d/20-igbinary.ini
./mods-available/igbinary.ini
./fpm/conf.d/20-igbinary.ini
stevewi@bill:/etc/php/7.2$ find . -name *redis* 
./cli/conf.d/20-redis.ini
./mods-available/redis.ini
./fpm/conf.d/20-redis.ini

• ./cli/conf.d/20-igbinary.ini and ./fpm/conf.d/20-igbinary.ini should be symlinks to ./mods-available/igbinary.ini:

stevewi@bill:/etc/php/7.2$ ll ./cli/conf.d/20-igbinary.ini
lrwxrwxrwx 1 root root 40 <date> ./cli/conf.d/20-igbinary.ini -> /etc/php/7.2/mods-available/igbinary.ini

• - ./cli/conf.d/20-redis.ini and ./fpm/conf.d/20-redis.ini should be symlinks to ./mods-available/redis.ini:

stevewi@bill:/etc/php/7.2$ ll ./cli/conf.d/20-redis.ini
lrwxrwxrwx 1 root root 40 <date> ./cli/conf.d/20-redis.ini -> /etc/php/7.2/mods-available/redis.ini

Most likely, the symlinks are missing. You can can establish them by

stevewi@bill:~$ cd /etc/php/7.2
stevewi@bill:/etc/php/7.2$ sudo ln -s /etc/php/7.2/mods-available/redis.ini ./cli
stevewi@bill:/etc/php/7.2$ sudo ln -s /etc/php/7.2/mods-available/redis.ini ./fpm
stevewi@bill:/etc/php/7.2$ sudo ln -s /etc/php/7.2/mods-available/igbinary.ini ./cli
stevewi@bill:/etc/php/7.2$ sudo ln -s /etc/php/7.2/mods-available/igbinary.ini ./fpm

• If you are using php-fpm, it needs to be restarted:

stevewi@bill:/etc/php/7.2$ sudo systemctl restart php72-fpm

• You can try your searches with the PHP cli processor again.

The install of the php-redis and php-igbinary packages should have done all this for you (php-redis is dependent on php-igbinary).

WARNING! The above assumes you are using Debian/Ubuntu.

WARNING! WARNING! WARNING! You can seriously mess up your system doing all this. I take no responsibility for your actions.

-- sw