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How to save multidimensional information about an array when performing intersections of arrays in PHP?

I have many arrays containing an identifier as a primary key, with multidimensional information under each identifier. Here are two examples:

Mask of the first example:

array
  14181 => 
    array
      'industries' => 
        array
          'weight' => string '105652' (length=6)
          'count' => string '11' (length=2)
  48354 => 
    array
      'industries' => 
        array
          'weight' => string '508866' (length=6)
          'count' => string '10' (length=2)

Second example:

array
  16434 => 
    array
      'business_types' => 
        array
          'weight' => string '104614' (length=6)
          'count' => string '1' (length=1)
  48354 => 
    array
      'business_types' => 
        array
          'weight' => string '103610' (length=6)
          'count' => string '10' (length=2)

I would like to get the intersection of many arrays like these (based on the key), but I need to save the weight and count the data from each array for each key. Note the different weight and quantity data from each array. In this case, the business type and industry.

Required End Array:

array
  48354 => 
    array
      'business_types' => 
        array
          'weight' => string '103610' (length=6)
          'count' => string '10' (length=2)
      'industries' => 
        array
          'weight' => string '508866' (length=6)
          'count' => string '10' (length=2)

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+3
1

, , .

<?php

$a1 = array(14181 => array('industries'     => array('weight' => "105652", 'count' => "11")),
            48354 => array('industries'     => array('weight' => "508866", 'count' => "10")));
$a2 = array(16434 => array('business_types' => array('weight' => "104614", 'count' => "1")),
            48354 => array('business_types' => array('weight' => "103610", 'count' => "10")));

//print_r($a1);
//print_r($a2);

foreach($a2 as $a2k => $a2v)
{
    // The loop below should only go through once, but if there are multiple types it will be ok
    foreach($a2v as $a2vk => $a2vv)
    {
        $a1[$a2k][$a2vk] = $a2vv;
    }
}

printf("Output:\n");
print_r($a1);

printf("Output:\n");
print_r($a1);

:

Output:
Array
(
    [14181] => Array
        (
            [industries] => Array
                (
                    [weight] => 105652
                    [count] => 11
                )

        )

    [48354] => Array
        (
            [industries] => Array
                (
                    [weight] => 508866
                    [count] => 10
                )

            [business_types] => Array
                (
                    [weight] => 103610
                    [count] => 10
                )

        )

    [16434] => Array
        (
            [business_types] => Array
                (
                    [weight] => 104614
                    [count] => 1
                )

        )

)

, , .

: , , . . :

<?php

$a1 = array(14181 => array('industries'     => array('weight' => "105652", 'count' => "11")),
            48354 => array('industries'     => array('weight' => "508866", 'count' => "10")));
$a2 = array(16434 => array('business_types' => array('weight' => "104614", 'count' => "1")),
            48354 => array('business_types' => array('weight' => "103610", 'count' => "10")));

//print_r($a1);
//print_r($a2);

// Pass the smaller array as first argument
if(count($a1) <= count($a2))
{
    $res = my_merge($a1, $a2);
}
else
{
    $res = my_merge($a2, $a1);
}

function my_merge($a1, $a2)
{
    $res = array();
    foreach($a1 as $a1k => $a1v)
    {
        if(array_key_exists($a1k, $a2))
        {
            $res[$a1k] = array_merge($a1[$a1k], $a2[$a1k]);
        }
    }
    return $res;
}

printf("Output:\n");
print_r($res);

:

Array
(
    [48354] => Array
        (
            [industries] => Array
                (
                    [weight] => 508866
                    [count] => 10
                )

            [business_types] => Array
                (
                    [weight] => 103610
                    [count] => 10
                )

        )

)
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