PHP array ignore duplicate values

Question

What would be the best way to ignore the duplicates for customer_name in this grouped array? I only want to display a list of unique names.

Array
(
    [1] => Array
        (
            [0] => Array
                (
                    [model_id] => 1
                    [work_order] => 10999
                    [id] => 1
                    [model_name] => STC1.5
                    [stock] => 3
                    [free] => 1
                    [customer_name] => Jane Doe
                )

            [1] => Array
                (
                    [model_id] => 1
                    [work_order] => 10998
                    [id] => 1
                    [model_name] => STC1.5
                    [stock] => 3
                    [free] => 1
                    [customer_name] => Jane Doe
                )

        )
)

have you tried array_unique()? this should work for you `array_unique($array, SORT_REGULAR);` — A l w a y s S u n n y, Jul 30 '18 at 16:16
Possible duplicate of [How to remove duplicate values from a multi-dimensional array in PHP](https://stackoverflow.com/questions/307674/how-to-remove-duplicate-values-from-a-multi-dimensional-array-in-php) — Script47, Jul 30 '18 at 16:18
The question is not clear. Do you need to get only the list of `customer_name`s without duplicates or you need to remove some entries of the array to avoid having two entries with the same `customer_name`? If the latter case is the correct one then you should define the rules of ignoring the duplicates (apart from them having the same `customer_name`). What entry to keep when a duplicate is detected? The first one? The last one? The one that have the smallest/biggest value in `id`? etc. — axiac, Jul 30 '18 at 16:22
I need to display a list of all customer names unless they are duplicated. It doesn't matter which is displayed as long as all the names are unique. — user3616336, Jul 30 '18 at 16:25

MonkeyZeus · Answer 1 · 2018-07-30T16:30:58.430

Assuming that you ONLY care about unique names and $arr is:

Array
(
    [1] => Array
        (
            [0] => Array
                (
                    [model_id] => 1
                    [work_order] => 10999
                    [id] => 1
                    [model_name] => STC1.5
                    [stock] => 3
                    [free] => 1
                    [customer_name] => Jane Doe
                )

            [1] => Array
                (
                    [model_id] => 1
                    [work_order] => 10998
                    [id] => 1
                    [model_name] => STC1.5
                    [stock] => 3
                    [free] => 1
                    [customer_name] => Jane Doe
                )

        )
)

then you can use:

$unique_names = array_keys(array_flip(array_column($arr[1],'customer_name')));

If you are concerned about micro-optimization then try:

$unique_names = array();

foreach( $arr[1] as $v )
{
    $unique_names[$v['customer_name']] = $v['customer_name'];
}

There are easier (and probably faster) ways to get the list of (unique) names. — axiac, Jul 30 '18 at 16:24
When I commented, the answer was using `array_map()` with a user function callback. — axiac, Jul 30 '18 at 16:40

Andreas · Answer 2 · 2018-07-30T16:33:37.473

0

You can create an array with only the name with array_column and use array_unique on that.
Then use array_intersect_key to get the corresponding subarrays from the main array.

$name = array_unique(array_column($arr[1], "customer_name"));
$unique = array_intersect_key($arr, $name);

edited Jul 30 '18 at 16:33

answered Jul 30 '18 at 16:25

Andreas

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PHP array ignore duplicate values

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