How can you make a multidimensional array unique?

I've got a multidimensional array setup like the following:

array(
  [0]=>
  array(
    ["name"]=> "Foo"
    ["slug"]=> "Bar"
  )
  [1]=>
  array(
    ["name"]=> "Foo"
    ["slug"]=> "Bar"
  )
  [2]=>
  array(
    ["name"]=> "Test 1"
    ["slug"]=> "test-1"
  )
  [3]=>
  array(
    ["name"]=> "Test 2"
    ["slug"]=> "test-2"
  )
  [4]=>
  array(
    ["name"]=> "Test 3"
    ["slug"]=> "test-3"
  )
)

What would be the best way to search through the area for duplicates values in "name" and remove them, so that each value in the multidimensional array is unique?

Thanks in advance!

You can use an associative array.

$temp_array = array();
foreach ($array as &$v) {
    if (!isset($temp_array[$v['name']]))
        $temp_array[$v['name']] =& $v;
}

This creates a temporary array, using $v['name'] as the key. If there is already an element with the same key, it is not added to the temporary array.

You can convert the associative array back to a sequential array, using

$array = array_values($temp_array);

Example code and output: http://codepad.org/zHfbtUrl

Since everyone given alternatives, here's a solution to the problem at-hand. Sometimes we have to work with the data we have, not re-arrange it the way we like it. That being said, this will remove all sub-sequent entries from the array that are duplicates.

$array = Array(
  Array(
    'name'  => 'Test 3',
    'slug'  => 'test-3'
  ),
  Array(
    'name'  => 'Foo',
    'slug'  => 'Bar'
  ),
  Array(
    'name'  => 'Foo',
    'slug'  => 'Bar'
  ),
  Array(
    'name'  => 'Test 1',
    'slug'  => 'test-1'
  ),
  Array(
    'name'  => 'Test 2',
    'slug'  => 'test-2'
  ),
  Array(
    'name'  => 'Test 3',
    'slug'  => 'test-3'
  ),
);
var_dump($array);

for ($e = 0; $e < count($array); $e++)
{
  $duplicate = null;
  for ($ee = $e+1; $ee < count($array); $ee++)
  {
    if (strcmp($array[$ee]['name'],$array[$e]['name']) === 0)
    {
      $duplicate = $ee;
      break;
    }
  }
  if (!is_null($duplicate))
    array_splice($array,$duplicate,1);
}
var_dump($array);

Which will look like this:

array(6) {
  [0]=>
  array(2) {
    ["name"]=>
    string(6) "Test 3"
    ["slug"]=>
    string(6) "test-3"
  }
  [1]=>
  array(2) {
    ["name"]=>
    string(3) "Foo"
    ["slug"]=>
    string(3) "Bar"
  }
  [2]=>
  array(2) {
    ["name"]=>
    string(3) "Foo"
    ["slug"]=>
    string(3) "Bar"
  }
  [3]=>
  array(2) {
    ["name"]=>
    string(6) "Test 1"
    ["slug"]=>
    string(6) "test-1"
  }
  [4]=>
  array(2) {
    ["name"]=>
    string(6) "Test 2"
    ["slug"]=>
    string(6) "test-2"
  }
  [5]=>
  array(2) {
    ["name"]=>
    string(6) "Test 3"
    ["slug"]=>
    string(6) "test-3"
  }
}
array(4) {
  [0]=>
  array(2) {
    ["name"]=>
    string(6) "Test 3"
    ["slug"]=>
    string(6) "test-3"
  }
  [1]=>
  array(2) {
    ["name"]=>
    string(3) "Foo"
    ["slug"]=>
    string(3) "Bar"
  }
  [2]=>
  array(2) {
    ["name"]=>
    string(6) "Test 1"
    ["slug"]=>
    string(6) "test-1"
  }
  [3]=>
  array(2) {
    ["name"]=>
    string(6) "Test 2"
    ["slug"]=>
    string(6) "test-2"
  }
}

$array = array(
    0 => array(
        "name"=> "Foo",
        "slug"=> "Bar"
    ),
    1 => array(
        "name"=> "Foo",
        "slug"=> "Bar"
    ),
    2 => array(
        "name"=> "Test 1",
        "slug"=> "test-1"
    ),
    3 => array(
        "name"=> "Test 2",
        "slug"=> "test-2"
    ),
    4 => array(
        "name"=> "Test 3",
        "slug"=> "test-3"
    )
);



function array_unique_by_key (&$array, $key) {
    $tmp = array();
    $result = array();
    foreach ($array as $value) {
        if (!in_array($value[$key], $tmp)) {
            array_push($tmp, $value[$key]);
            array_push($result, $value);
        }
    }
    return $array = $result;
}

array_unique_by_key($array, "name");

Just looking at your particular case, I would recommend using a hash table instead of a 2-dimensional array. If you use your "name" as the key in the hash, each entry would be unique.

Is there a specific need for the multidimensional array?