how to check if class instances are instanceof another class

Question

In php, it seems that a class is not a subclass of itself

php > var_dump(is_subclass_of('Exception', 'Exception')); bool(false) php > var_dump(is_subclass_of('ErrorException', 'Exception')); bool(true)

However, instances of Exception and ErrorException are both instances of Exception, and that is the property I want to check for. Is there a function I could replace is_subclass_of with that would make the output be true for both expressions?

@u_mulder I never said it should be... if you read my question I want a function that returns true because instances of Exception are instances of Exception, and instances of ErrorException are instances of ErrorException — xuanji
– xuanji, Commented Feb 23, 2016 at 20:36
@rjdown that function requires its first argument to be an object, not a class name — xuanji
– xuanji, Commented Feb 23, 2016 at 20:37

Barmar · Accepted Answer · 2016-02-23 20:25:10Z

Define your own function that checks whether they're the same class name or one is a subclass of the other.

function same_or_subclass_of($class, $parent) { return $class == $parent || is_subclass_of($class, $parent); }

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