When using PHP to connect to Redis, you may encounter some errors. One such error is the “PHP new Redis” error. This article explains the causes of this error and provides solutions.

1. Cause of error

When we use "php new Redis", the following error message may appear:

PHP?Fatal?error:??Uncaught?Error:?Class?'Redis'?not?found?...

This is because there is no Redis in the PHP standard library Extension. Therefore, we need to install the Redis extension and import it into PHP.

2. Solution

1. Install Redis extension

On Linux, we can use the following command to install the Redis extension:

sudo?apt-get?install?php-redis

For Windows users, you can download the corresponding Redis extension from the official website and extract it to the PHP extension directory, and enable it in the php.ini file.

2. Check whether Redis is installed

After completing the Redis extension installation, we need to check whether Redis has been correctly imported into PHP. You can check it by the following method:

Create a simple PHP script and add the following command in the code:

phpinfo();

Save and run this script, you will see a web page containing the current PHP configuration information. Look for the "Redis" column on this page. If you can find it, it means that the Redis extension has been correctly imported into PHP.

3. Check if the Redis server is running

If none of the above methods solve the problem, it may be because the Redis server is not starting or is stopping. We can use the following command to check whether the Redis server is running:

service?redis-server?status

If the Redis server is starting or stopping, we need to wait for a while before trying to connect.

In short, when using PHP to connect to Redis, once a "PHP new Redis" error occurs, we need to first ensure that the Redis extension has been correctly installed and imported into PHP, and secondly, we need to check whether the Redis server is running.

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