Backdoors in some PHP management system programs

Some php website management programs and some backdoors are not actually malicious, mainly for your own security. I don't care much about the prompt box. how does SABLOG know that my version has a vulnerability? the program must have a backdoor. each time you log on to the background, the official version is automatically checked and compared with the current version. well. later I found it. in templates/admin/main. the last part of php. delete the following code and you will be OK.
In fact, this is not enough to lead to hacking. now it is generally a bit common sense, the password is more complex, a few numbers + a few letters, MD5 is generally difficult to run out. if there is a rainbow table, say...

The code is as follows: