Troubleshooting of Sonar issue

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How to resolve "Define and throw a dedicated exception instead of using a generic one"

Error condition which met "Define and throw a dedicated exception instead of using a generic one" ^[1]

if(is_null($some_variable)){
            $error = 'The variable $some_variable is not defined.';
            throw new Exception($error);
        }

Possible solution

if(!is_null($some_variable)){
            $error = 'The variable $some_variable is not defined.';
            throw new InvalidArgumentException($error);
        }