array intersect for object array php

Question

I want to know how to array_intersect for object array.

Answer 1

Had a similar problem a few days ago, while these are answers are on the right path; I used them to work out the following:

From Artefacto's answer return $obj1 == $obj2 didn't really work, so I wrote a simple comparative function (basically gets the md5 of the serialised object and compares that):

function object_compare($obj1, $obj2){
  $md5 = function($obj){
    return md5(serialize($obj));
  };
  return strcmp($md5($obj1), $md5($obj2));
}

Then it’s jut a matter of calling array_uintersect with our comparative function to get the intersection:

# $array1 / $array2 are the array of objects we want to compare
return array_uintersect($array1, $array2, 'object_compare');

In my case, I had an unknown / dynamic array of objects, so I took it a step further so I don't have to declare array_uintersect($array1, $array2, ...) specifically - but just be able to pass in an array of arrays (of objects):

# $multiarray_of_objects is our array of arrays
$multiarray_of_objects[] = 'object_compare';
return call_user_func_array('array_uintersect', $multiarray_of_objects);

Just gotta remember to pass in the reference to our callback / comparative function as the last string in the array. Works like a charm!