php - get rid of duplicate items from array of objects in php [duplicate]

Question

how to remove duplicates in php associative array? The array is created from JSON.

    array (size=646)
  0 => 
    object(stdClass)[1]
      public 'id' => string '1' (length=1)
      public 'name' => string 'John' (length=4)
      public 'city' => string 'NY' (length=2)

  1 => 
    object(stdClass)[3]
      public 'id' => string '2' (length=1)
      public 'name' => string 'Henry' (length=5)
      public 'city' => string 'Mexico' (length=6)
  2 => 
    object(stdClass)[5]
      public 'id' => string '2' (length=1)
      public 'name' => string 'Jordan' (length=6)
      public 'city' => string 'Lake' (length=4)
              ...

I've tried to use array_unique($data) but I'm still getting the duplicate values. I just want to get those unique elements by its id. TIA.

Do you consider duplicate values as objects with the same id property? Which of the two given objects with id = 2 has the higher priority? — VisioN
– VisioN, Commented Feb 12, 2018 at 17:23
You can reindex the array by id: $unique = array_column($array, null, 'id'); (Needs PHP 7) — Don't Panic
– Don't Panic, Commented Feb 12, 2018 at 17:36
@Barmar To be fair, all answers in the question that you've pointed, are so rubbish... — VisioN
– VisioN, Commented Feb 12, 2018 at 17:43

VisioN · Accepted Answer · 2018-02-12 17:34:28Z

1

One possible solution:

$arr = array_values(array_reduce($arr, function($arr, $x) {
    $arr[$x->id] = $x;
    return $arr;
}, []));

answered Feb 12, 2018 at 17:34

VisioN

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