CODEWITHSUNDEEP
phparrays
Karem
Karem

Reputation: 18103

PHP: Checking difference between two multidim arrays

Here's the two arrays dump:

array(2) { 
    [0]=> array(7) { 
        ["id"]=> string(1) "1" 
        ["shoppinglist_id"]=> string(1) "1" 
        ["product_id"]=> string(1) "1" 
        ["amount"]=> string(1) "5" 
        ["date_added"]=> string(10) "1326912709"
        ["name"]=> string(7) "Tunfisk" 
        ["supplier_id"]=> string(1) "2" 
    } 
    [1]=> array(7) { 
        ["id"]=> string(1) "2" 
        ["shoppinglist_id"]=> string(1) "1" 
        ["product_id"]=> string(1) "2" 
        ["amount"]=> string(1) "5" 
        ["date_added"]=> string(10) "1326912713" 
        ["name"]=> string(3) "Lax" 
        ["supplier_id"]=> string(1) "6" 
    } 
}

array(2) { 
    [0]=> array(7) { 
        ["id"]=> string(1) "5" 
        ["shoppinglist_id"]=> string(1) "3" 
        ["product_id"]=> string(1) "1" 
        ["amount"]=> string(1) "5" 
        ["date_added"]=> string(10) "1326912810" 
        ["name"]=> string(7) "Tunfisk" 
        ["supplier_id"]=> string(1) "2" 
    } 
    [1]=> array(7) { 
        ["id"]=> string(1) "6" 
        ["shoppinglist_id"]=> string(1) "3" 
        ["product_id"]=> string(1) "2" 
        ["amount"]=> string(1) "5" 
        ["date_added"]=> string(10) "1326912810" 
        ["name"]=> string(3) "Lax" 
        ["supplier_id"]=> string(1) "6" 
    } 
}

I tried to do array_diff() but this does not support multi-dimensional arrays.

So then i tried this function:

public function multidimensional_array_diff($a1,$a2)
{
  $r = array();

 foreach ($a2 as $key => $second)
 {
      foreach ($a1 as $key => $first)
      {

            if (isset($a2[$key]))
            {
                foreach ($first as $first_arraykey => $first_value)
                {

                    foreach ($second as $second_value)
                    {
                        if ($first_value == $second_value)
                        {
                            $true = true;
                            break;   
                        }
                    }
                    if (!isset($true))
                    {
                        if($first_arraykey != "date_added" && $first_arraykey != "shoppinglist_id")
                        {
                            $r[$key][$first_arraykey] = $first_value;
                        }

                    }
                    unset($true);
                }
            }
            else
            {
                $r[$key] = $first;
            }
      }
 }
  return $r;
}

This does not work either, returns me differences, that arent different.

Note as you can see it does not add to the difference array if the array key are date_added and shoppinglist_id (because, it's OK in my system that these are different).

The above should output an empty difference array, since there are no difference between those array (if we dont look at date_added and shoppinglist_id).

How can i make this work properly?

Upvotes: 1

Views: 3453

Answers (1)

Some intelligent guy
Some intelligent guy

Reputation: 266

In the comments to array_diff, some recursive examples are given. This one seems to do, what you are searching for:

<?php 
function arrayRecursiveDiff($aArray1, $aArray2) { 
    $aReturn = array(); 

    foreach ($aArray1 as $mKey => $mValue) { 
        if (array_key_exists($mKey, $aArray2)) { 
            if (is_array($mValue)) { 
                $aRecursiveDiff = arrayRecursiveDiff($mValue, $aArray2[$mKey]); 
                if (count($aRecursiveDiff)) { $aReturn[$mKey] = $aRecursiveDiff; } 
            } else { 
                if ($mValue != $aArray2[$mKey]) { 
                    $aReturn[$mKey] = $mValue; 
                } 
            } 
        } else { 
            $aReturn[$mKey] = $mValue; 
        } 
    } 

    return $aReturn; 
} 
?>

Source: http://www.php.net/manual/en/function.array-diff.php#91756

Upvotes: 8

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