How to catch undefined functions with set_error_handler in PHP

Question

I\'m taking the leap: my PHP scripts will ALL fail gracefully!

At least, that\'s what I\'m hoping for...`

I don\'t want to wrap (practically) every single line i

Answer 1

From the documentation (emphasis added):

The following error types cannot be handled with a user defined function: E_ERROR, E_PARSE, E_CORE_ERROR, E_CORE_WARNING, E_COMPILE_ERROR, E_COMPILE_WARNING, and most of E_STRICT raised in the file where set_error_handler() is called.

Calling undefined functions triggers an E_ERROR, thus it can not be handled by the error callback (or by exception handlers for that matter). All that you can do is set error_reporting to 0.

PS, if you are rolling your own error handler, you should take care to handle correctly the @ operator. From the documentation (emphasis added):

It is important to remember that the standard PHP error handler is completely bypassed. error_reporting() settings will have no effect and your error handler will be called regardless - however you are still able to read the current value of error_reporting and act appropriately. Of particular note is that this value will be 0 if the statement that caused the error was prepended by the @ error-control operator.