Ladmin | EasyLms is a development management system with Laravel | Web Framework library

It's because you initialize your properties every time you access them. A way to initialize them only once might look like this for example. But there are other ways as well.

I understood that you have issues on storing data in currently filled List, so here are one solution, use for instead if foreach, and then you can edit the specific member of the list, using it's index (I considered that CAdmin is inherited from User and User class has properties for CName and CPassword):

The actual problem that persisted was the fact that there is a Linux Security module called SE-Linux(Security-Enhanced Linux) was enforced on my machine which provides a mechanism for supporting access control security policies, like MAC. It does not allow commands like shell_exec be executed by users other than the ones who have the permission to, like root user.

To get the the status of SE-Linux type in your shell sestatus or getenforced. It has 3 modes:

1) Enforcing: SE-Linux policy is enforced. SE-Linux denies access based on SE-Linux policy rules.

2)Permissive: SE-Linux policy is not enforced. SE-Linux does not deny access, but denials are logged for actions that would have been denied if running in enforcing mode.

3)Disabled: SE-Linux is disabled.

Hope this helps others, who might get stuck because of this.

Your port variable is an int, you must convert it to str first:

You are in fact converting port to a str at some moment, but later assign it to an int in the scope of the function: port = 8888.
Maybe the remnant of some debugging code?