Solutions to php undefined variables and other errors

In the project, the error level is set to: error_reporting(E_ALL | E_STRICT);
An error will be reported if the array variable is not defined, which is actually quite good, but sometimes there is really no need to report this error. PHP’s solution is:
@$_GET ['unkown'];
This way, the error message can be displayed.

The above introduces the solutions to errors such as undefined PHP variables, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.