Frank Kleine has voiced his disapproval with what he calls the "Inheritance Nazi" exception handling PHP has natively.
The built-in Exception class in PHP is total crap. It is an inheritance nazi preventing you from doing useful stuff in your own exception classes. Whoever made its get*() methods final and the trace property private did not thought any second about how exceptions may be used or that people need to implement their own stack trace handling.
The reason for the rant is due to a project he's currently working at where he cannot overload the stack trace of an exception instance then throw the exception. This forces him to create his own exception handling, pointless when the PHP one should be able to handle what he wants.
Suggestions/thoughts in the comments sympathize with him and suggest an alternate exception method - an interface that would allow for more customization.
For more information on the exception handling PHP has, check out the manual page for it.