php remove duplicates from array

Question

I was wondering if anyone could help me out, I'm trying to find a script that will check my entire array and remove any duplicates if required, then spit out the array in the same format.

Here's an example of my array (as you will see there are some duplicates):

You have a lot of nested arrays. Which duplicates do you mean? E.g. the first subarray contains an object with ID `57`. Does that mean, this object should be removed in the second (and all further) subarray(s)? — Felix Kling, May 18 '10 at 21:35
*Probably duplicate* : http://stackoverflow.com/questions/307674/how-to-remove-duplicate-values-from-a-multi-dimensional-array-in-php — Felix Kling, May 18 '10 at 21:38
yep, that's what I'm after.. I know it's multidimensional but if there's duplicate of anything from any of the subarrays it should be removed :) — SoulieBaby, May 18 '10 at 21:38

score 5 · Answer 1 · answered May 18 '10 at 21:33

5

You can remove duplicates from an array by doing:

$array = array_values(array_unique($array));

answered May 18 '10 at 21:33

Gazler

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Joe L. · Answer 2 · 2014-05-09T14:37:34.000

4

Try this, it works with large arrays:

$original = array('one', 'two', 'three', 'four', 'five', 'two', 'four');
$filtered = array();
foreach ($original as $key => $value){
    if(in_array($value, $filtered)){
        continue;
    }
    array_push($filtered, $value);
}

print_r($filtered);

Outputs:

Array
(
    [0] => one
    [1] => two
    [2] => three
    [3] => four
    [4] => five
)

edited May 09 '14 at 14:37

answered Oct 02 '12 at 17:34

Joe L.

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3 years later and this helped me with my coder writer's block. – Don Boots Nov 17 '14 at 15:01

score 3 · Accepted Answer · answered May 18 '10 at 21:34

3

Use the array_unique function.

Here is an implentation of a multi-dimensional array_unique function.

function super_unique($array)
{
  $result = array_map("unserialize", array_unique(array_map("serialize", $array)));

  foreach ($result as $key => $value)
  {
    if ( is_array($value) )
    {
      $result[$key] = super_unique($value);
    }
  }

  return $result;
}

Not tested, from the comments in the function manual.

answered May 18 '10 at 21:34

Boris Guéry

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+1, however that seems awfully familiar (http://stackoverflow.com/questions/1247950/how-to-remove-duplicated-2-dimension-array-in-php/1248189#1248189)... xP – Alix Axel May 18 '10 at 21:40
1

You need to cast the objects to arrays and use `array_merge`. – Alix Axel May 18 '10 at 21:42
Tried the code from the other thread but doesn't work with my array, it still comes up with duplicates.. – SoulieBaby May 18 '10 at 21:45
this function `super unique` works only on 2 dimentions arrays i tried it and it works but only on 2D – Qchmqs Oct 22 '11 at 09:48

Marcus Adams · Answer 4 · 2010-05-18T22:12:04.320

0

My PHP's rusty, but something like this should work:

function makeUniqueBidArray(&$array)
{
  $tempArray = array();
  foreach($array as $bidArray) {
    foreach($bidArray as $bid) {
      if (isset($tempArray[$bid->bid]) {
        unset($bid);
      } else {
        $tempArray[$bid->bid] = $bid->name;
      }
    }
  }
}

edited May 18 '10 at 22:12

answered May 18 '10 at 22:00

Marcus Adams

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score 0 · Answer 5 · answered Jul 17 '10 at 22:43

0

stop using your own array splitting function that causes duplicates and read the php manual page on array_chunk

answered Jul 17 '10 at 22:43

Kris

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php remove duplicates from array

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