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
– Felix Kling, Commented May 18, 2010 at 21:35
Probably duplicate : stackoverflow.com/questions/307674/… — Felix Kling
– Felix Kling, Commented May 18, 2010 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
– SoulieBaby, Commented May 18, 2010 at 21:38

Gazler · Accepted Answer · 2010-05-18 21:33:54Z

5

You can remove duplicates from an array by doing:

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

answered May 18, 2010 at 21:33

Gazler

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Joe L. · Accepted Answer · 2014-05-09 14:37:34Z

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 9, 2014 at 14:37

answered Oct 2, 2012 at 17:34

Joe L.

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1 Comment

Don Boots Over a year ago

3 years later and this helped me with my coder writer's block.

Boris Guéry · Accepted Answer · 2010-05-18 21:34:22Z

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, 2010 at 21:34

Boris Guéry

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4 Comments

Alix Axel Over a year ago

+1, however that seems awfully familiar (stackoverflow.com/questions/1247950/…)... xP

Alix Axel Over a year ago

You need to cast the objects to arrays and use array_merge.

SoulieBaby Over a year ago

Tried the code from the other thread but doesn't work with my array, it still comes up with duplicates..

Qchmqs Over a year ago

this function super unique works only on 2 dimentions arrays i tried it and it works but only on 2D

Marcus Adams · Accepted Answer · 2010-05-18 22:12:04Z

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, 2010 at 22:12

answered May 18, 2010 at 22:00

Marcus Adams

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Comments

Kris · Accepted Answer · 2010-07-17 22:43:20Z

0

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

answered Jul 17, 2010 at 22:43

Kris

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