合并，删除重复项并在php中排序关联数组

Question

I am trying to merge arrays in php. Everything is coming from a database and two different results could look like this:

array[0]['id_user'] = 1
array[0]['tokenId'] = 123
array[1]['id_user'] = 2
array[1]['tokenId'] = 456
array[2]['id_user'] = 5
array[2]['tokenId'] = 789

array[0]['id_user'] = 1
array[0]['tokenId'] = 123
array[1]['id_user'] = 2
array[1]['tokenId'] = 752
array[2]['id_user'] = 3
array[2]['tokenId'] = 789

Using array_merge() and then array_unique() should give me something like this I expect:

unique_and_merged_array[0]['id_user'] = 1
unique_and_merged_array[0]['tokenId'] = 123
unique_and_merged_array[1]['id_user'] = 2
unique_and_merged_array[1]['tokenId'] = 456
unique_and_merged_array[2]['id_user'] = 5
unique_and_merged_array[2]['tokenId'] = 789
unique_and_merged_array[3]['id_user'] = 2
unique_and_merged_array[3]['tokenId'] = 752
unique_and_merged_array[4]['id_user'] = 3
unique_and_merged_array[4]['tokenId'] = 789

Then how can I sort by id_user value? I'm not sure to understand the different sorting php functions ...

Answer 1

The PHP-based solution could look something like this:

//Define arrays for testing
$array1[0]['id_user'] = 1;
$array1[0]['tokenId'] = 123;
$array1[1]['id_user'] = 2;
$array1[1]['tokenId'] = 456;
$array1[2]['id_user'] = 5;
$array1[2]['tokenId'] = 789;

$array2[0]['id_user'] = 1;
$array2[0]['tokenId'] = 123;
$array2[1]['id_user'] = 2;
$array2[1]['tokenId'] = 752;
$array2[2]['id_user'] = 3;
$array2[2]['tokenId'] = 789;

//Define sort function - compares arrays using the 'id_user' value
function sortByUserId($array1, $array2)
{
    if ($array1['id_user'] == $array2['id_user']) {
        return 0;
    }
    return ($array1['id_user'] < $array2['id_user']) ? -1 : 1;
}

//Merge arrays
$unique_and_merged_array = array_merge($array1, $array2);

//Remove duplicate entries - note SORT_REGULAR in order to work with multidimensional arrays
$unique_and_merged_array = array_unique($unique_and_merged_array, SORT_REGULAR);

//Sort the arrays
uasort($unique_and_merged_array, 'sortByUserId');

//Enjoy  ;)
var_dump($unique_and_merged_array);