Johannes "Schlüter" wrote:
On Sat, 2009-12-19 at 01:42 +0100, Johannes Mueller wrote:
if($foo instanceof bar){
..
}
// runs without any notification
instanceof is a language construct expecting a class identifier.
It doesn't complain about on-existing classes as it would need to
trigger the __autoloader which might be way too much.
and
if(is_a($foo, bar)){
..
}
// runs with an undefined constant bar notification
is_a() is a function expecting a string. And this warning is unrelated
to the fact that the class "bar" doesn't exist, but due to the way PHP
treats undefined constants.
Thank you for your answers, that is what I've expected. Unfortunately this
is sometimes annoying when using namespaces, where you have to take care of
the namespaces too.
I do understand the performance impact of a more complex solution and my
fault was to mix two different operations. I expected instanceof and is_a()
to check if the class exists.
My personal problem was, that I didn't recognized instanceof to treat the
requested class as a normal string, even it is not enclosed by quotation
marks.
The only protective barrier in this case seems to be a skilled IDE, that
helps you to avoid referencing non existant classes.
Cheers
Johannes
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