来自一个变量的不同数组的相同值

Question

I have a question, because I can't figure it out and I can't find it anywhere (maybe the wrong search-words I don't know..). I have the following:

Array
(
    [0] => Array
        (
            [Factuurnummer] => 50
            [Omschrijving] => Thing 1
        )

    [1] => Array
        (
            [Factuurnummer] => 50
            [Omschrijving] => Thing 2
        )

    [2] => Array
        (
            [Factuurnummer] => 51
            [Omschrijving] => Thing 2
        )

    [3] => Array
        (
            [Factuurnummer] => 51
            [Omschrijving] => Thing 3
        )

    [4] => Array
        (
            [Factuurnummer] => 51
            [Omschrijving] => Thing 4
        )

)

Now when I use a foreach to print it all in a table I get 5 rows, but I only want 2, based on the same 'Factuurnummer'. So 1 row with 'Factuurnummer'=50 and 'Omschrijving'=Thing 1, Thing 2 and another row with 'Factuurnummer'=51 and 'Omschrijving'=Thing 2, Thing 3, Thing 4.

I've read something about array_intersect, but I don't know if that will help in this case. The nicest would be if the value from 'Omschrijving' based on same 'Factuurnummer' would be separated with a comma (like my little example).

Hope I was clear enough and someone could help me in the right direction!

Answer 1

You should rewrite your array before you print it, assuming above array is called $data:

$facturen = array();
foreach($data as $row) {
    $factuurnummer = $row['Factuurnummer'];
    if (!isset($facturen[$factuurnummer])) {
        $facturen[$factuurnummer] = array();
    }
    $facturen[$factuurnummer][] = $row['Omschrijving'];
}

// On display:
foreach($facturen as $factuurnummer => $omschrijvingen) {
     echo $factuurnummer.': '.implode(', ', $omschrijvingen);
}

Answer 2

You can easily use array_walk() to write your data into an array with more usable format:

$new_array = array();
array_walk($existing_array, function($item, $key_not_used) use ($new_array) {
    $new_array[$item['Factuurnummer']][] = $item['Omschrijving'];
});
var_dump($new_array);