How to intersect Array of objects in PHP?

Question

How do i get the result of intersection between two Array of Objects in PHP.

For Example,

the value of $array1 is

Array
(
    [0] => stdClass Object
        (
            [id] => 2
            [influencer_id] => 2
            [follower_id] => 1
        )

)

and the value of $array2 is,

Array
(
    [0] => stdClass Object
        (
            [id] => 2
            [influencer_id] => 1
            [follower_id] => 2
        ),
    [1] => stdClass Object
        (
            [id] => 3
            [influencer_id] => 3
            [follower_id] => 2
        ),

)

So, what i want to get in $result is

Array
(
    [0] => stdClass Object
        (
            [id] => 2
            [influencer_id] => 2
            [follower_id] => 1
        )

)

What is the best way to get it?

Thanks in advance!

Do you mean the object of $array2[0] has the same value of $array1[0]? If so I think there is a misstyping. — Javakid
– Javakid, Commented Jun 16, 2015 at 7:02
No. if any element in $array2 matches with any element with $array1 that should be in the result. note that the elements are object here. — cse031sust02
– cse031sust02, Commented Jun 16, 2015 at 7:42

jmgross · Accepted Answer · 2015-06-16 07:44:52Z

5

You can do that using array_uintersect function and defining manually your callback comparison function :

$arr1 = json_decode('[{"id":2,"influencer_id":2,"follower_id":1}]');
$arr2 = json_decode('[{"id":2,"influencer_id":2,"follower_id":1},{"id":3,"influencer_id":3,"follower_id":2}]');

$arr3 = array_uintersect($arr1, $arr2, function ($e1, $e2) { 
    if($e1->id == $e2->id && $e1->influencer_id == $e2->influencer_id && $e1->follower_id == $e2->follower_id) {
        return 0;
    } else {
        return 1;
    }
});

var_dump($arr3);

answered Jun 16, 2015 at 7:44

jmgross

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Comments

Anonymous Duck · Accepted Answer · 2015-06-16 06:49:38Z

0

Try to use array_intersect

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

answered Jun 16, 2015 at 6:49

Anonymous Duck

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2 Comments

cse031sust02 Over a year ago

It gives this error "Object of class stdClass could not be converted to string"

Anonymous Duck Over a year ago

nah comparing objects, read this post for this stackoverflow.com/questions/2834607/…

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