Make array unique in multidimensional array php codeigniter

Question

I have this array

Array (

[0] => Array
    (
        [0] => stdClass Object
            (
                [id] => 226
                [user_id] => 1
                [name] => Eden Corner Tub by Glass - $2099

            )

        [1] => stdClass Object
            (
                [id] => 225
                [user_id] => 1
                [name] => Blue Quilted Leather Jacket by Minusey - $499

            )

        [2] => stdClass Object
            (
                [id] => 222
                [user_id] => 1
                [name] => Darling New Bathtub by Duravit - $6300

            )



    )

[1] => Array
    (
        [0] => stdClass Object
            (
                [id] => 226
                [user_id] => 1
                [name] => Eden Corner Tub by Glass - $2099
            )

        [1] => stdClass Object
            (
                [id] => 229
                [user_id] => 1
                [name] => Batman Tumbler Golf Cart - $50000

            )

        [2] => stdClass Object
            (
                [id] => 228
                [user_id] => 1
                [name] => Swirlio Frozen Fruit Dessert Maker - $60

            )

    )    )

I have an array of products that I need to make sure are unique. Need to make this array unique by id. These array are generated by pushing value.

I'm trying to solve this for more than a week now, but I dont get it to work. I know it should be easy...but anyway - I don't get it :D

What do you mean by unique? Unique by id? And where that array come from? From db? — baldrs
– baldrs, Commented Aug 1, 2014 at 12:10
Wouldn't array_unique work for you? php.net/manual/en/function.array-unique.php — Ronni Egeriis Persson
– Ronni Egeriis Persson, Commented Aug 1, 2014 at 12:16
@RonniEgeriis no, it won't, because elements are considered unique by their string representation, thus array of arrays won't be uqinue'd correctly. (string) array() is Array + notice. — baldrs
– baldrs, Commented Aug 1, 2014 at 12:24
Sorry guys, actually i already posted wrong array. this is the correct array to be make unique — jai
– jai, Commented Aug 1, 2014 at 12:44

baldrs · Accepted Answer · 2014-08-01 13:37:51Z

1

Try this:

$array = array(

    0 =>  array(  
        "name"   => "test",  
        "id"    =>  4  
    ),  
    1   =>  array(  
        "name" =>  "test2",  
        "id" => 152  
    ), 
    2   =>  array(  
        "name" =>  "test2",  
        "id" => 152  
    )
 );

$newArray = array();
foreach($array as $value) {
    $newArray[$value['id']]['name'] = $value['name'];
    $newArray[$value['id']]['id'] = $value['id']; 
}

edited Aug 1, 2014 at 13:37

baldrs

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answered Aug 1, 2014 at 12:17

Sougata Bose

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Comments

Bishal Paudel · Accepted Answer · 2014-08-01 12:18:07Z

0

foreach($array as $key=>$inner_array)
{
    foreach($array as $key_again=>$array_again)
    {
        if($key != $key_again)
        {
            if($inner_array['name'] != $array_again['name'] AND $inner_array['id'] != $array_again['id'])
            {
                //its okay
            }
            else
            {
                unset($array[$key]);
            }
        }
    }
}

answered Aug 1, 2014 at 12:18

Bishal Paudel

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Comments

Vlad Cazacu · Accepted Answer · 2014-08-01 12:19:31Z

0

Not sure how the arrays are generated, but, if you can change that, you could set the array keys to the IDs directly and check if the id is already set.

Otherwise, you can do the following:

$unique = array();

foreach( $array as $values ) {
    if( ! isset( $unique[$values['id']] ) ) {
        $unique[$values['id']] = $values;
    }
}

answered Aug 1, 2014 at 12:19

Vlad Cazacu

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Comments

baldrs · Accepted Answer · 2014-08-01 12:22:37Z

0

This will make your array unique:

$array = array(
  0 =>  array(  
    "name"   => "test",  
    "id"    =>  4  
  ),  
  1   =>  array(  
    "name" =>  "test2",  
    "id" => 152  
  ), 
  2   =>  array(  
    "name" =>  "test2",  
    "id" => 152  
  ) );

$result = array();

$index = array();

foreach($array as $i => $elem) {
  if(!isset($index[$elem['id']])) {
    $result[$i] = $elem;

    $index[$elem['id']] = 1;
  }
}

echo var_export($result);

Output:

array (
  0 => 
  array (
    'name' => 'test',
    'id' => 4,
  ),
  1 => 
  array (
    'name' => 'test2',
    'id' => 152,
  ),
)

answered Aug 1, 2014 at 12:22

baldrs

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Comments

Ronni Egeriis Persson · Accepted Answer · 2014-08-01 12:47:17Z

0

This will work. It could be considered more clean than a for loop, but I'm not sure about performance.

$array = [
    [ "name" => "test", "id" => 4 ],
    [ "name" => "test2", "id" => 152 ], 
    [ "name" => "test2", "id" => 152 ]
];

array_walk($array, function(&$item, $idx) use($array){
    $matches = array_slice(array_keys($array, $item), 1);
    if (in_array($idx, $matches)) {
        $item = false;
    }
});
$array = array_filter($array);

Edit Since you updated the data set to work with, you would need to flatten it 1 level:

$array = call_user_func_array('array_merge', $array);

answered Aug 1, 2014 at 12:47

Ronni Egeriis Persson

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4 Comments

jai Over a year ago

Actually i already posted wrong array. this is the correct array to be make unique

jai Over a year ago

i have tried to flatten it to 1 level, like you told using call_user_func_array function but nothing happened

Ronni Egeriis Persson Over a year ago

Could you provide a JSON dump? It's hard to work a var_dump output

jai Over a year ago

I somehow flatten the array like this:

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