"how to check for a specific type of object in php" Code Answer
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You can use
instanceof
:Be aware though, you can't negate like
!instanceof
, so you'd instead do:Also, looking over your question, you can use object type-hinting, which helps enforce requirements, as well as simplify your check logic:
Typed arguments can be required or optional:
Untyped arguments allow for flexibility through explicit conditions:
As for the latter (using
method_exists
), I'm a bit mixed in my opinion. People coming from Ruby would find it familiar torespond_to?
, for better or for worse. I'd personally write an interface and perform a normal type-hint against that:However, that's not always feasible; in this example,
PDO
objects are not valid parameters as the base type doesn't implementQueryableInterface
.It's also worth mentioning that values have types, not variables, in PHP. This is important because
null
will fail aninstanceof
check.The value loses it's type when it becomes
null
, a lack of type.