Accessing object value from nested objects in mongodb with php

MongoDB Atlas
,
6

So I just finished the Course and understood how to use aggregate but when i use the aggregation and use var_dump it just shows me this

image

how do I save the candidate_id value to a array or variable ?

I tried using foreach loop like this

the aggregation code and for loop

$cursor4 = $collection3->aggregate([['$project' => ['_id' => 0, 'Blocks.FirstBlock.candidate_id' => 1]]]);

$result = $cursor4->toArray();

foreach ($result as $row)

{

$canid[] = $row["candidate_id"];

}