in_array - 'in_object' equivalent?

Question

Is there such a function like in_array, but can be used on objects?

Answer 1

Nope, but you can cast the object to an array and pass it into in_array().

$obj = new stdClass; $obj->one = 1; var_dump(in_array(1, (array) $obj)); // bool(true) 

That violates all kinds of OOP principles though. See my comment on your question and Aron's answer.