重复数组不会使用php显示

Question

I have an array, I want to show only unique "referal_user_id" array. In the code have four array and there are repeated "referal_user_id" i want when one time "referal_user_id" called then not repeated again. Like i want this array as second array.

Array
(
    [0] => stdClass Object
        (
            [id] => 23
            [user_id] => 21
            [referal_user_id] => 16
            [membership_name] => 4
            [points] => 100
            [used_code] => CEMJ916
            [earned_date] => 2018-06-11 06:34:00
        )

    [1] => stdClass Object
        (
            [id] => 24
            [user_id] => 22
            [referal_user_id] => 16
            [membership_name] => 4
            [points] => 400
            [used_code] => CEMJ916
            [earned_date] => 2018-05-31 06:42:07
        )

    [2] => stdClass Object
        (
            [id] => 25
            [user_id] => 16
            [referal_user_id] => 1
            [membership_name] => 2
            [points] => 200
            [used_code] => CEMJ916
            [earned_date] => 2018-06-06 08:36:46
        )

    [3] => stdClass Object
        (
            [id] => 27
            [user_id] => 15
            [referal_user_id] => 1
            [membership_name] => 1
            [points] => 100
            [used_code] => 64FPY1
            [earned_date] => 2018-06-11 06:46:03
        )

)

How can i filter unique array

This array show like

Array
(
    [0] => stdClass Object
        (
            [id] => 23
            [user_id] => 21
            [referal_user_id] => 16
            [membership_name] => 4
            [points] => 100
            [used_code] => CEMJ916
            [earned_date] => 2018-06-11 06:34:00
        )

    [1] => stdClass Object
        (
            [id] => 25
            [user_id] => 16
            [referal_user_id] => 1
            [membership_name] => 2
            [points] => 200
            [used_code] => CEMJ916
            [earned_date] => 2018-06-06 08:36:46
        )

)

Answer 1

You can use the classic foreach to group the array into a multidimensional array. Use array_values to convert the multidimensional array to simple array.

$result = array();
foreach( $arr as $val ) {
    if ( !isset( $result[$val->referal_user_id] ) ) $result[$val->referal_user_id] = $val;
}

$result = array_values( $result );

echo "<pre>";
print_r( $result );
echo "</pre>";

This will result to:

Array
(
    [0] => stdClass Object
        (
            [id] => 23
            [user_id] => 21
            [referal_user_id] => 16
            [membership_name] => 4
            [points] => 100
            [used_code] => CEMJ916
            [earned_date] => 2018-06-11 06:34:00
        )

    [1] => stdClass Object
        (
            [id] => 25
            [user_id] => 16
            [referal_user_id] => 1
            [membership_name] => 2
            [points] => 200
            [used_code] => CEMJ916
            [earned_date] => 2018-06-06 08:36:46
        )

)