Hi, Thank you for the feedback!
The latest update v1.59
adds STD* constants. Previously, they were only defined in CLI projects, so we enabled them in Web projects as well.
Next, we're going to deal with non-default extensions like Memcache.
As a recommended workaround for IDEs in general, you can always include the following file in your project:
https://github.com/php-memcached-dev/php-memcached/blob/master/php_memcached.stub.php
Those stubs exist for all extensions.