如何处理异常记录

Question

I have a complex web app that I am adding error logging to, I want to be able to log exceptions:

try{
//typically mysql queries but can involve PayPal api, Facebook api amongst others
        }
        catch($e){
            logger($e);
        }

Is it safe to assume $e will always be a string, if not is there a php function I can call which will always give me the string output of '$e', so that my logger can store the resulting output in my log table?

Answer 1

It's not c++, it's php that is why you need to throw either Exception object or instance of object that is subclass of Exception

From PHP manual

The thrown object must be an instance of the Exception class or a subclass of Exception. Trying to throw an object that is not will result in a PHP Fatal Error.

So that is why you always have access to Exception class methods for example:

• final public string getMessage ( void ) //Gets the Exception message
• final public string getTraceAsString ( void ) //Gets the stack trace as a string

that is why you can use catch(Exception $e){ echo $e->getMessage();} to get message of exception or trace which are always string.

If you want to pass Exception object you can extend Exception class and override __toString() method to fit your needs.

You can also be interested in Setting Exception Handler