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I have a multi-dimensional array that contains an associative array in every row. How to make it unique based on specified array key?

I already tried some method like: 

$cart = array_map("unserialize", array_unique(array_map("serialize", $cart)));

But failed to produce data as my expect my array structure look like:

Array
(
[0] => Array
 (
 [product_code] => prod3
 [qty] => 7
 )
[1] => Array
 (
 [product_code] => prod3
 [qty] => 1
 )
[2] => Array
 (
 [product_code] => prod4
 [qty] => 7
 )
[3] => Array
 (
 [product_code] => prod4
 [qty] => 7
 )
)

and I expect to get this result after using array array_unique() method. Just 2 records remaining:

Array
(
[1] => Array
 (
 [product_code] => prod3
 [qty] => 1
 )
[2] => Array
 (
 [product_code] => prod4
 [qty] => 7
 )
)
Alimin
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1 Answers1

2

You can use array_column to convert the array into an associative array. Which will override duplicate values. Use array_values to convert the associative array into a simple array.

$arr = //Your array

$result = array_values(array_column( $arr , null, 'product_code' ));

print_r( $result );

This will result to:

Array
(
    [0] => Array
        (
            [product_code] => prod3
            [qty] => 1
        )

    [1] => Array
        (
            [product_code] => prod4
            [qty] => 7
        )

)

Doc: array_column(), array_values()

Eddie
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