通过ID从PHP数组中删除重复项的快速方法

Question

I have an array and would like to remove duplicates. I'm using php. How to remove duplicate rows (by id).
My array looks like:

 Array
    (
        [0] => Array
            (
                [id] => 415
            ) 
        [1] => Array
            (
                [id] => 425
            )
        [2] => Array
            (
                [id] => 425
            )
        [3] => Array
            (
                [id] => 426
            )
     )

Answer 1

Assuming that id is the only element of the array, you can walk through the array using serialize and array_unique , as array_unique by itself doesn't work with multidimensional arrays.

$foo = array_map('unserialize', array_unique(array_map("serialize", $foo)));

If you have other elements, @Ghost's answer is probably better

Answer 2

This will also flatten the array to a 1-dimensional array

$data = array(
    array(
        'id' => 415,
    ),
    array(
        'id' => 425,
    ),
    array(
        'id' => 425,
    ),
    array(
        'id' => 426,
    ),
);


$data = array_unique(
    array_map('end', $data)
);
var_dump($data);

gives

Array
(
    [0] => 415
    [1] => 425
    [3] => 426
)