嵌套多个尝试/捕获 - 是否有更好的方法？

Question

I'm making a signup process that ends with a final script where the majority of the heavy lifting is done, after a user has made payment. These processes include:

• Updating our sales DB several times
• Making an external API post
• Downloading, amending and uploading a file via SFTP
• Sending confirmation emails

Essentially there's a lot of things to potenatially fail individually, all of which are critical and rely on the previous one working. I don't just want the final method to do all this to be along the lines of

try {
    $Signup->doEverything();
}
catch( Exception $e ) {
    echo "Something went wrong"
}

because that is no use to anybody.

I've ended up with a massive nested list of all these final processes that is now 11 deep - it does work, if one of the processes fails it dies with the correct exception, but seeing this many nests I just assume there should be a better way of handling all these processes.. Is this bad practice? Are there better solutions for dealing with large amounts of critical processes like this?

Answer 1

You should sub-class the exception class

i.e.

class ExceptionOne extends Exception
{

...

}

Then you can just have one try/catch block

i.e.

try
{

   ... i.e. throw an appropriate exception according to the problem

}
catch (ExceptionOne ex)
{
   ...
}
catch (ExceptionTwo ex)
{
   ...

}

etc.

catch (Exception ex)
{
   ... For a catch all
}