[Proposal] Modification to ?: functionality

I find in a lot of my code I have ternaries that set default values. I also find that I can't use the ?: syntax for one reason and one reason only. It throws a notice if the value isn't set. I believe these two statements are functionally equivalent: $foo = $foo ? $foo : 'default'; $foo = $foo ?: 'default'; I would like to change it so it also checks for isset() so I propose the following would be functionally equivalent: $foo = isset($foo) && $foo ? $foo : 'default'; $foo = $foo ?: 'default'; Random addition: what if we also allowed the following shorthand? $foo ?= 'default'; or possibly: $foo ?:= 'default'; Thanks everyone, Chris