Merge rows of two 2d arrays based on the shared column value and apply default values where expected column is missing

Question

I have two arrays which must be merged together on the dt_date column and I need to declare subscribers and unsubscribers in all rows in the result.

$array1 = [
    ['subscribers' => 2, 'dt_date' => '2014-02-27'],
    ['subscribers' => 2, 'dt_date' => '2014-02-25'],
    ['subscribers' => 1, 'dt_date' => '2014-02-07']
];
$array2 = [
    ['unsubscribers' => 1, 'dt_date' => '2014-02-27'],
    ['unsubscribers' => 1, 'dt_date' => '2014-02-01']
];

I need to create an array like as follows from the two arrays.

[
    ['subscribers' => 2, 'unsubscribers' => 1, 'dt_date' => '2014-02-27'],
    ['subscribers' => 2, 'unsubscribers' => 0, 'dt_date' => '2014-02-25'],
    ['subscribers' => 1, 'unsubscribers' => 0, 'dt_date' => '2014-02-07'],
    ['subscribers' => 0, 'unsubscribers' => 1, 'dt_date' => '2014-02-01']
]

I tried

$result = array_merge_recursive($aray1, $array2);

AND

$result = array_merge(
    $array1, 
    array_udiff(
        $array2,
        $array1, 
        function($array1,$array2){
            return strcmp($array1['dt_date'],$array2['dt_date']);
        }
    )
);  

But the result was not as expected

Answer 1

I find the answer

 $result= array_replace_recursive($array1,$array2);
 foreach ($result as $key => $value) {
    if(!isset($value['unsubscribers']))
        $result[$key]['unsubscribers']=0;
    if(!isset($value['subscribers']))
        $result[$key]['subscribers']=0;
 }

Thank you