array intersect for object array php

Question

I want to know how to array_intersect for object array.

Answer 1

array_intersect() returns an array containing all the values of array1 that are present in all the arguments.

Then what mean present in this context (exacly this function), i found on php.net my answer:

Two elements are considered equal if and only if (string) $elem1 === (string) $elem2. In words: when the string representation is the same.

Then you can't use it on array of objects if your objects not implements unique conversion to string.

Answer 2

nice toString function is already implemented and is called serialize ;) so

array_map(
    'unserialize',
    array_intersect(
        array_map(
            'serialize',
            $obj1
        ), 
        array_map(
            'serialize', 
            $obj2
        )
    )
);

will do the work, example mentioned higher don't work 'cause array_intersect work's only with strings as someone mentioned too