$ Name = @ $ _ POST ['name?

$ Name @ $ _ POST [name? $ Name = @ $ _ POST ['name?

What does @ in it mean?

Reply to discussion (solution)

Blocking error ..

Can it be specific? I have never touched on this writing method.

If there is an error in this sentence, no error will be reported @ blocking error

@ Shield error message

If you only use $ name = $ _ POST ['name'], there may be a Notice: Undefined index: name warning message.
Add @ to prevent the warning information from being printed.

But this is not the right way!
If the program runs through the post form, the $ _ POST ['name'] will not exist.
If the program runs directly, $ _ POST ['name'] does not exist. it is meaningless to perform subsequent processing on a group of non-existent data, it may even cause adverse consequences.

Shield warning information

Shield warning information for preprocessing

$ _ POST ['name'] should be handled during registration or login,
If none of them are connected, exit directly.

The error prompt is blocked. If this code generates a runtime error, it will not be prompted.