Redis.php : failed to open stream: No such file or directory

How can I install PHP extension for Redis on shared hosting with Apache/PHP 5.6

Thank you in advance.

Could be impossible on a shared hosting environment, if the provider doesn’t have given you the opportunity to turn certain extensions on by config. But some have in the backend an area for that. Like in Server config or PHP config section. Checkt that out first.

What do you want to suggest with your topic title?

Thank you for the response.
I had to cut the solution short by hosting the application on VPS, where I managed to run all I needed, Redis server and Redis extension. Now the site is working fine.