получить уникальные значения из ассоциативного массива в PHP?

Question

У меня есть массив, как показано ниже

Array
(
    [0] => Array
        (
            [catid] => 3
            [parent_id] => 1
            [catname] => Uncategorized
            [catdesc] => 
            [nleft] => 20
            [nright] => 21
            [nlevel] => 1
        )

    [1] => Array
        (
            [catid] => 5
            [parent_id] => 2
            [catname] => Category 2
            [catdesc] => 
            [nleft] => 7
            [nright] => 8
            [nlevel] => 2
        )

    [2] => Array
        (
            [catid] => 3
            [parent_id] => 1
            [catname] => Uncategorized
            [catdesc] => 
            [nleft] => 20
            [nright] => 21
            [nlevel] => 1
        )

    [3] => Array
        (
            [catid] => 3
            [parent_id] => 1
            [catname] => Uncategorized
            [catdesc] => 
            [nleft] => 20
            [nright] => 21
            [nlevel] => 1
        )

    [4] => Array
        (
            [catid] => 7
            [parent_id] => 2
            [catname] => Flower
            [catdesc] => 
            [nleft] => 11
            [nright] => 18
            [nlevel] => 2
        )

    [5] => Array
        (
            [catid] => 8
            [parent_id] => 7
            [catname] => Lillies
            [catdesc] => 
            [nleft] => 12
            [nright] => 13
            [nlevel] => 3
        )

    [6] => Array
        (
            [catid] => 10
            [parent_id] => 7
            [catname] => Jasmine
            [catdesc] => 
            [nleft] => 16
            [nright] => 17
            [nlevel] => 3
        )

    [7] => Array
        (
            [catid] => 7
            [parent_id] => 2
            [catname] => Flower
            [catdesc] => 
            [nleft] => 11
            [nright] => 18
            [nlevel] => 2
        )

    [8] => Array
        (
            [catid] => 8
            [parent_id] => 7
            [catname] => Lillies
            [catdesc] => 
            [nleft] => 12
            [nright] => 13
            [nlevel] => 3
        )

    [9] => Array
        (
            [catid] => 10
            [parent_id] => 7
            [catname] => Jasmine
            [catdesc] => 
            [nleft] => 16
            [nright] => 17
            [nlevel] => 3
        )

    [10] => Array
        (
            [catid] => 3
            [parent_id] => 1
            [catname] => Uncategorized
            [catdesc] => 
            [nleft] => 20
            [nright] => 21
            [nlevel] => 1
        )

    [11] => Array
        (
            [catid] => 3
            [parent_id] => 1
            [catname] => Uncategorized
            [catdesc] => 
            [nleft] => 20
            [nright] => 21
            [nlevel] => 1
        )

    [12] => Array
        (
            [catid] => 10
            [parent_id] => 7
            [catname] => Jasmine
            [catdesc] => 
            [nleft] => 16
            [nright] => 17
            [nlevel] => 3
        )

    [13] => Array
        (
            [catid] => 3
            [parent_id] => 1
            [catname] => Uncategorized
            [catdesc] => 
            [nleft] => 20
            [nright] => 21
            [nlevel] => 1
        )

    [14] => Array
        (
            [catid] => 8
            [parent_id] => 7
            [catname] => Lillies
            [catdesc] => 
            [nleft] => 12
            [nright] => 13
            [nlevel] => 3
        )

)

Из этого массива я хочу получить Unique Arrays.ie.Если catId такой же, его нужно исключить из списка.Как я могу это сделать?

Answer 1

Если вы используете старую версию:

$out = array();
foreach ($arr as $row) {
    $out[$row['catid']] = $row;
}
$array = array_values($out); // only required if you mind the new array being assoc

Answer 2

Если вы используете PHP> 5.3, вы можете использовать array_filter:

$catIds = array();
$myarray = array_filter($myarray, function($el) use (&$catIds) {
    if (in_array($el['catid'], $catIds)) { // if the id has already been seen
        return false; // remove it
    } else {
        $catIds[] = $el['catid']; // the id has now been seen
        return true; // but keep the first occurrence of it
    }
});

Answer 3

Вы можете использовать это для преобразования многомерного массива в один массив.

$out = array();
for($i=0;$i<count($rows);$i++) {
    $out = $rows[$i];
}

И вы можете проверить это по

print_r($out);

Answer 4

Откуда вы взяли этот массив (предполагая, что он волшебным образом не появляется)?Если вы получаете эти результаты из базы данных, не будет ли намного проще ограничить их там?Например,

SELECT DISTINCT cat_id, parent_id, catname FROM yourtable;