Sorting a php array of arrays by custom order

Question

I have an array of arrays:

Array ( 
    [0] => Array (
        [id] = 7867867,
        [title] = 'Some Title'),
    [1] => Array (
        [id] = 3452342,
        [title] = 'Some Title'),
    [2] => Array (
        [id] = 1231233,
        [title] = 'Some Title'),
    [3] => Array (
        [id] = 5867867,
        [title] = 'Some Title')
)

The need to go in a specific order:

1. 3452342
2. 5867867
3. 7867867
4. 1231233

How would I go about doing that? I have sorted arrays before, and read plenty of other posts about it, but they are always comparison based (ie valueA < valueB).

Help is appreciated.

Answer 1

I have an array of arrays:

Array ( 
    [0] => Array (
        [id] = 7867867,
        [title] = 'Some Title'),
    [1] => Array (
        [id] = 3452342,
        [title] = 'Some Title'),
    [2] => Array (
        [id] = 1231233,
        [title] = 'Some Title'),
    [3] => Array (
        [id] = 5867867,
        [title] = 'Some Title')
)

The need to go in a specific order:

1. 3452342
2. 5867867
3. 7867867
4. 1231233

How would I go about doing that? I have sorted arrays before, and read plenty of other posts about it, but they are always comparison based (ie valueA < valueB).

Help is appreciated.

Answer 2

I have an array of arrays:

Array ( 
    [0] => Array (
        [id] = 7867867,
        [title] = 'Some Title'),
    [1] => Array (
        [id] = 3452342,
        [title] = 'Some Title'),
    [2] => Array (
        [id] = 1231233,
        [title] = 'Some Title'),
    [3] => Array (
        [id] = 5867867,
        [title] = 'Some Title')
)

The need to go in a specific order:

1. 3452342
2. 5867867
3. 7867867
4. 1231233

How would I go about doing that? I have sorted arrays before, and read plenty of other posts about it, but they are always comparison based (ie valueA < valueB).

Help is appreciated.

Answer 3

I have an array of arrays:

Array ( 
    [0] => Array (
        [id] = 7867867,
        [title] = 'Some Title'),
    [1] => Array (
        [id] = 3452342,
        [title] = 'Some Title'),
    [2] => Array (
        [id] = 1231233,
        [title] = 'Some Title'),
    [3] => Array (
        [id] = 5867867,
        [title] = 'Some Title')
)

The need to go in a specific order:

1. 3452342
2. 5867867
3. 7867867
4. 1231233

How would I go about doing that? I have sorted arrays before, and read plenty of other posts about it, but they are always comparison based (ie valueA < valueB).

Help is appreciated.

Answer 4

I have an array of arrays:

Array ( 
    [0] => Array (
        [id] = 7867867,
        [title] = 'Some Title'),
    [1] => Array (
        [id] = 3452342,
        [title] = 'Some Title'),
    [2] => Array (
        [id] = 1231233,
        [title] = 'Some Title'),
    [3] => Array (
        [id] = 5867867,
        [title] = 'Some Title')
)

The need to go in a specific order:

1. 3452342
2. 5867867
3. 7867867
4. 1231233

How would I go about doing that? I have sorted arrays before, and read plenty of other posts about it, but they are always comparison based (ie valueA < valueB).

Help is appreciated.

Answer 5

I have an array of arrays:

Array ( 
    [0] => Array (
        [id] = 7867867,
        [title] = 'Some Title'),
    [1] => Array (
        [id] = 3452342,
        [title] = 'Some Title'),
    [2] => Array (
        [id] = 1231233,
        [title] = 'Some Title'),
    [3] => Array (
        [id] = 5867867,
        [title] = 'Some Title')
)

The need to go in a specific order:

1. 3452342
2. 5867867
3. 7867867
4. 1231233

How would I go about doing that? I have sorted arrays before, and read plenty of other posts about it, but they are always comparison based (ie valueA < valueB).

Help is appreciated.

Answer 6

I have an array of arrays:

Array ( 
    [0] => Array (
        [id] = 7867867,
        [title] = 'Some Title'),
    [1] => Array (
        [id] = 3452342,
        [title] = 'Some Title'),
    [2] => Array (
        [id] = 1231233,
        [title] = 'Some Title'),
    [3] => Array (
        [id] = 5867867,
        [title] = 'Some Title')
)

The need to go in a specific order:

1. 3452342
2. 5867867
3. 7867867
4. 1231233

How would I go about doing that? I have sorted arrays before, and read plenty of other posts about it, but they are always comparison based (ie valueA < valueB).

Help is appreciated.

Answer 7

I have an array of arrays:

Array ( 
    [0] => Array (
        [id] = 7867867,
        [title] = 'Some Title'),
    [1] => Array (
        [id] = 3452342,
        [title] = 'Some Title'),
    [2] => Array (
        [id] = 1231233,
        [title] = 'Some Title'),
    [3] => Array (
        [id] = 5867867,
        [title] = 'Some Title')
)

The need to go in a specific order:

1. 3452342
2. 5867867
3. 7867867
4. 1231233

How would I go about doing that? I have sorted arrays before, and read plenty of other posts about it, but they are always comparison based (ie valueA < valueB).

Help is appreciated.

Answer 8

I bump into this same problem and @mickmackusa has the answer I need. The selected answer does not sort when there is a NULL value. For example:

$order = array(3, 2, 10);
$array = array(
    array('id' => NULL, 'title' => 'any order since null but not top'),
    array('id' => NULL, 'title' => 'any order since null but not top'),
    array('id' => NULL, 'title' => 'any order since null but not top'),
    array('id' => 2, 'title' => 'should be top'),
);
usort($array, function ($a, $b) use ($order) {
    $pos_a = array_search($a['id'], $order);
    $pos_b = array_search($b['id'], $order);
    return $pos_a - $pos_b;
});

The results above will show an output of:

array(4) {
  [0]=>
  array(2) {
    ["id"]=>
    NULL
    ["title"]=>
    string(32) "any order since null but not top"
  }
  [1]=>
  array(2) {
    ["id"]=>
    NULL
    ["title"]=>
    string(32) "any order since null but not top"
  }
  [2]=>
  array(2) {
    ["id"]=>
    NULL
    ["title"]=>
    string(32) "any order since null but not top"
  }
  [3]=>
  array(2) {
    ["id"]=>
    int(2)
    ["title"]=>
    string(13) "should be top"
  }
}

In @mickmackusa's answer, not only it eliminates null in the sorting but also put in the first whatever is available in the order basis. So since in the array the only available is 2 then that would be on top.

Although it doesn't work in PHP 5.6. So I convert it to PHP 5.6 compatible. This is what I got

usort($array, function($a, $b) use($order, $default) {
    $a = (isset($order[$a['id']]) ? $order[$a['id']] : $default);
    $b = (isset($order[$b['id']]) ? $order[$b['id']] : $default);

    if($a == $b) return 0;
    elseif($a > $b) return 1;
    return -1;
});

The result for the sort above would be

array(4) {
  [0]=>
  array(2) {
    ["id"]=>
    int(2)
    ["title"]=>
    string(13) "should be top"
  }
  [1]=>
  array(2) {
    ["id"]=>
    NULL
    ["title"]=>
    string(32) "any order since null but not top"
  }
  [2]=>
  array(2) {
    ["id"]=>
    NULL
    ["title"]=>
    string(32) "any order since null but not top"
  }
  [3]=>
  array(2) {
    ["id"]=>
    NULL
    ["title"]=>
    string(32) "any order since null but not top"
  }
}

I hope my conversion of the code would help dev who works on an obsolete server with lower php version.

Answer 9

This is how I sort my multi-dimensional array in ASC order based on id value:

$arrayFilter = array(
    array('product_tag' => 'xenia', 'id' => 4),
    array('product_tag' => 'worn',  'id' => 5),
    array('product_tag' => 'woven', 'id' => 3),
    array('product_tag' => 'nude', 'id' => 1)
);

for ($i = 0; $i < sizeof($arrayFilter); $i++) {
    for ($j=$i+1; $j < sizeof($arrayFilter); $j++) {
        if ($arrayFilter[$i]['id'] > $arrayFilter[$j]['id']) {
            $c = $arrayFilter[$i];
            $arrayFilter[$i] = $arrayFilter[$j];
            $arrayFilter[$j] = $c;
        }
    }
}
print_r($arrayFilter);

OUTPUT:

Array
(
    [0] => Array
        (
            [product_tag] => nude
            [id] => 1
        )

    [1] => Array
        (
            [product_tag] => woven
            [id] => 3
        )

    [2] => Array
        (
            [product_tag] => xenia
            [id] => 4
        )

    [3] => Array
        (
            [product_tag] => worn
            [id] => 5
        )
)