How do I write the code of the website background check version and leave a backdoor?

How do I write the code of the website background check version and leave a backdoor? You want to add a function in the website background:

If the customer's current version is earlier than my latest version, the upgrade will be reminded.

In addition, some customers do not pay for the remaining funds on their websites. can they leave a backdoor? if they don't give the remaining funds or swear, they will use a secret address to unlink () their website source code.

Thank you for thinking.

Reply to discussion (solution)

There are many methods for version check on the internet. I personally recommend that you describe various types of information in xml. enable xml file check on the portal. if the version is earlier than version, the upgrade information is returned. We do not recommend direct unlink. if the loss may result in a lawsuit, you can set a Super Portal. if he does not pay, he will directly lock the core function.

There are many methods for version check on the internet. I personally recommend that you describe various types of information in xml. enable xml file check on the portal. if the version is earlier than version, the upgrade information is returned. We do not recommend direct unlink. if the loss may result in a lawsuit, you can set a Super Portal. if he does not pay, he will directly lock the core function.

Yes. I will delete the php files of some important modules without clearing their databases and Uploading folders.


How should I write this superentry? Never done, never seen

You don't have to think too complicated.
For example, index. php is very common.
You can add a dedicated method to it to create a backdoor.
For example:

It is okay for people who do not understand the code, and leave it blank for those who do not understand it. isn't the user a customer? If he wants to swear, it is not because your services are not in place. there is always a reason. it is important to improve the service quality, it is better to spend more energy on your products than to manage rebellious users.

Thank you for choosing the third floor.


The moderator on the fourth floor is right. In most cases, if you are satisfied with the customer, you can get the money, but in this world, everyone has it, I am helpless because I have the idea of having no reason to get away with the best payment.