The error I receive when starting spark is

Constant FILTER_SANITIZE_STRING is deprecated

can anyone solve the problem?

CodePudding user response：

You're using a PHP version that is too new for the codeigniter version you installed.

If you're using PHP 8.1 you need at least codeigniter 4.1.7

Solutions:

• Option1: Downgrade PHP
• Option2: Upgrade Codeigniter

Reference: https://codeigniter.com/user_guide/changelogs/v4.1.7.html