The undefined Keyword

By Hammed Oyedele

This is valid PHP code.

Well, I just discovered you can use an object instance as a constant and also have a class with the same name in PHP.

Laravel have the same concept for missing values except they didn’t actually create a global constant for it.

This would upset some people for sure, but proof of concepts are not a crime!

See Also

• Original method

• undefined in action [Try me]

PHP Features

• constant

• class

• naming