PHP Fatal error: Cannot use isset() on the result of an expression1

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  PHP Fatal error: Cannot use isset() on the result of an expression PHP Fatal error: Cannot use isset() on the result of an expression isset()함수를 사용할 때 안에 값에 변수에 $ 안붙였을 때 많이 발생. 예시) isset(test); // Bad; isset($test); // Good; Server Language/PHP 2020. 3. 9.