PHP de-duplicate keys in different objects in array

Question

I have an array with series of objects and I want to search through the objects to compare and remove duplicates. An example of the structure is:

Array
(
    [0] => stdClass Object
        (
            [lrid] => 386755343029
            [uu] => website.address.com
        )

    [1] => stdClass Object
        (
            [lrid] => 386755342953
            [uu] => website.address.com
        )
)

With the UU key being a website address and I only want to show the first version rather than the duplicate. Any help would be greatly appreciated.

KingCrunch · Accepted Answer · 2011-06-20 20:54:42Z

3

$sites = array();
foreach ($array as $object) {
  if (!array_key_exists($object->uu, $sites)) {
    $sites[$object->uu] = $object;
  }
}

If you want a "normal array", use array_values() with $sites as argument.

answered Jun 20, 2011 at 20:54

KingCrunch

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Community · Accepted Answer · 2023-11-20 22:45:59Z

1

If the objects are identical, you should be able to simply call array_unique($array);

https://www.php.net/manual/en/function.array-unique.php

If the objects are different but just have the same id's, you can implement the __toString() method (note two underscores in front) and have it return (string)$this->id; That will cause the array_unique function (which casts to string) to call the magic method you implemented and get just the id's of the object.

You may have to implement the magic method anyway to make sure array_unique doesn't fail when it tries to cast your objects to strings, I don't remember.

edited Nov 20, 2023 at 22:45

CommunityBot

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answered Jun 20, 2011 at 21:00

Chad

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