PHP Comprehensive Object Difference Function - php

Question

Does anyone know of a php function that will take in two objects and return a complete set of differences back as an object?
I'll use json encoded data as an example of what I'm trying to accomplish:
Object A:
{
"Name":"Original",
"Id": 5,
"Data":{
"Value1": 1,
"Value2": [
5, 7, 8, 10
],
"Value3": {
"Exists": true
}
}
}
Object B:
{
"Name":"ThisNameChanged",
"Id": 5,
"Data":{
"Value1": 7,
"Value2": [
5, 8, 9
],
"Value3": {
"Exists": true
}
}
}
Would return:
{
"Name":"ThisNameChanged",
"Data":{
"Value2": {
"1": 8,
"2": 9
}
}
}
If no such function exists (which I guess is likely), how might I write a function to do this? Would anyone be able to provide an example, or the function?

Answer 1

Here is some simple example of function you ask for,
but it is not perfect, just food for thought for you:
function objDiff ($obj1, $obj2) {
$diff=array();
$obj1Arr = (array)$obj1;
$obj2Arr = (array)$obj2;
foreach ($obj1Arr as $key=>$val) {
if (!(isset($obj2Arr[$key]) && $obj2Arr[$key]===$val )) {
if (gettype($val)=='object') {
if (isset($obj2Arr[$key])) {
if (gettype($obj2Arr[$key])=='object') {
$subDiff = objDiff($val,$obj2Arr[$key]);
$diff[$key]=$subDiff;
} else {
$diff[$key]=array($val,$obj2Arr[$key]);
}
} else {
$diff[$key]=array($val,$obj2Arr[$key]);
}
} else {
$diff[$key]=array($val,(isset($obj2Arr[$key]))?$obj2Arr[$key]:null);
}
}
}
return $diff;
}
with this data:
$obj1 = new stdClass();
$obj1->test1 = 1;
$obj1->test2 = 2;
$subObj = new stdClass();
$subObj->test1 = 1;
$subObj->test2 = 2;
$obj1->test3 = $subObj;
$obj2 = new stdClass();
$obj2->test1 = 3;
$obj2->test2 = 4;
$subObj = new stdClass();
$subObj->test1 = 3;
$subObj->test2 = 2;
$obj2->test3 = $subObj;
print_r(objDiff($obj1,$obj2) );
it returns:
Array
(
[test1] => Array
(
[0] => 1
[1] => 3
)
[test2] => Array
(
[0] => 2
[1] => 4
)
[test3] => Array
(
[test1] => Array
(
[0] => 1
[1] => 3
)
)
)

Answer 2

Thanks to Kim Alexander, I was able to write a code that accomplished what I was looking to do.
function objDiff($obj1, $obj2, $diff = null) {
if (is_null($diff))
$diff = new stdClass;
$obj1Arr = (array)$obj1;
$obj2Arr = (array)$obj2;
foreach($obj1Arr as $key => $val) {
if (isset($obj2Arr[$key]))
{
if ($obj2Arr[$key] != $val)
{
if (is_object($obj2Arr[$key]) && is_object($val))
$diff->$key = objDiff($val, $obj2Arr[$key]);
else
$diff->$key = $obj2Arr[$key];
}
}
}
return $diff;
}