Question

What is the closest you can get to a try-catch block in php4?

I’m in the middle of a callback during an xmlrpc request and it’s required to return a specifically structured array no matter what.

I have to error check all accesses to external resources, resulting in a deep stack of nested if-else blocks, ugly.

Answer 1

Late answer, I realise, sorry. I hope this is still relevant for you:

First, I’m echoing the comments your got in response to your post. PHP5 is the way to go.

However:

I’m in the middle of a callback during
an xmlrpc request and it’s required to
return a specifically structured array
no matter what.

If you can vouch for that the program cannot possibly continue without getting a structured array back, and you absolutely have to work with PHP4, then an exit() or die() with detailed error information will get you much the same effect as a fatal exception would.

That’s far removed from being graceful, of course. If you want something catchable, then return values and if-checking the result are your best bet, unfortunately. There are some standard ways of passing back specific error objects, but it’s still the same thing – return the error object, if-check whether the result was an error object, react.

Still, take a look at PEAR’s error object.