Php variable undefined and other error solutions

: Php variable undefined and other error solutions: Set the error level in the project to error_reporting (E_ALL | E_STRICT); array variable undefined will also report an error, in fact, it is quite good, but sometimes this error does not need to be reported. The PHP solution is: @ $ _ GET [unkown]. in this way, the error prompt can be placed. set the error level to error_reporting (E_ALL | E_STRICT) in the project );
If the array variable is undefined, an error is returned. In fact, it is quite good, but sometimes this error is not required. The PHP solution is as follows:
@ $ _ GET ['unkown '];
In this way, the error message is displayed.

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