What's wrong with redis?

Question

PHP

The site displays an error:

Fatal error: Uncaught Error: Class 'Redis' not found in /var/www/html/inc/system/redis.php:2 Stack trace: #0 /var/www/html/index.php(6): include() #1 {main} thrown in /var/www/html/inc/system/redis.php on line 2

redis.php file

<?php
$redis = new Redis();
$redis->connect('localhost:6379');
?>

What is the error and how to fix it?

Answer 1

Well, that's where the error is...

Answer 2

https://github.com/phpredis/phpredis#installingcon...