php, compare arrays and append difference - php

Question

I have these two arrays:
1:
Array
(
[0] => stdClass Object
(
[id] => 1
[name] => Type 1
[rate] => 100.00
)
[1] => stdClass Object
(
[id] => 2
[name] => Type 2
[rate] => 75.00
)
[2] => stdClass Object
(
[id] => 3
[name] => Type 3
[rate] => 50.00
)
[3] => stdClass Object
(
[id] => 4
[name] => Type 4
[rate] => 50.00
)
)
2:
Array
(
[0] => stdClass Object
(
[name] => Type 1
[rate] => 125
)
[1] => stdClass Object
(
[name] => Type 2
[rate] => 85
)
[2] => stdClass Object
(
[name] => Type 3
[rate] => 65
)
)
What I need to do is compare the two arrays, and append missing items from 1st array to the 2nd one. This will always be the case first array will have more items than the second one.
I have tried using something like:
$result = array_udiff($array1,$array2,
function ($obj_a, $obj_b) {
return $obj_a->name - $obj_b->name;
}
);
but it just returns an empty array

Answer 1

This?
<?php
$arr1 = array(
(object)array("id"=>1,"name"=>"type 1","rate"=>100.00),
(object)array("id"=>2,"name"=>"type 2","rate"=>75.00),
(object)array("id"=>3,"name"=>"type 3","rate"=>50.00),
(object)array("id"=>4,"name"=>"type 4","rate"=>50.00)
);
$arr2 = array(
(object)array("name"=>"type 1","rate"=>125),
(object)array("name"=>"type 2","rate"=>85),
(object)array("name"=>"type 3","rate"=>65)
);
for($i=0;$i<sizeof($arr1);$i++){
$count=0;
for($j=0;$j<sizeof($arr2);$j++){
if($arr1[$i]->name == $arr2[$j]->name){
$count++;
}
}
if($count==0){
array_push($arr2,(object)array("name"=>$arr1[$i]->name,"rate"=>$arr1[$i]->rate));
}
}
print_r($arr2);
?>

Answer 2

Doesn't need to be complicated, assuming that you allow the arrays to contain objects of the same type and structure. We don't have enough context given the question to understand whether there is a good reason you can't.
//$array1 original array
//$array2 target array
$array2 = array_merge($array1, $array2);