Why does fputcsv wrap strings in quotes?

Question

PHP

The script collects data from different .xls files into an array, which is then immediately uploaded to CSV.
There are 2 types of files, both .XLS, but the structure is slightly different: in one, the lines are combined, so you have to mess around with them; besides, all the same, one of these lines stores several necessary data at once, well at least separated by the "|" symbol.
One way or another, the same array is obtained from both types of files: Article, manufacturer, price, quantity.
Examples of arrays, from two different files:

Array
(
    [1] => Array
        (
            [sku] => KR0867M
            [maker] => KRAUF
            [name] => Модуль в сборе с бензонасосом
            [quantity] => 1
            [price] => 2508
        )

    [2] => Array
        (
            [sku] => SMD030764
            [maker] => CHERY
            [name] => Прокладка помпы
            [quantity] => 1
            [price] => 75
        )
)

Array
(
    [1] => Array
        (
            [sku] =>  2300235K01J 
            [maker] => GREAT WALL 
            [name] =>  ПОДШИПНИК РОЛИКОВЫЙ ШЕСТЕРНИ БЛОКИРОВКИ ПЕРЕДНЕГО МОСТА HOVER  - 2300235-K01
            [quantity] => 1
            [price] => 117.08
        )

    [2] => Array
        (
            [sku] =>  2310012K01 
            [maker] => GREAT WALL 
            [name] =>  ШЕСТЕРНЯ БЛОКИРОВКИ ПЕРЕДНЕГО МОСТА HOVER
            [quantity] => 1
            [price] => 1266.19
        )
)

But for some reason, when exporting, some array elements are framed with quotation marks and a space, and some are not.
Here is the code for writing to .CSV:

$filename = explode(".", $file);
$output = fopen('csv/'.$filename[0].'.csv', 'w');
fputs($output, chr(0xEF) . chr(0xBB) . chr(0xBF)); // BOM
foreach ($row as $key) 
{
        fputcsv($output, $key, ';');
}

Here is what is written to .CSV files, respectively:

KR0867M;KRAUF;"Модуль в сборе с бензонасосом";1;2508
SMD030764;CHERY;"Прокладка помпы";1;75

" 2300235K01J ";"GREAT WALL ";" ПОДШИПНИК РОЛИКОВЫЙ ШЕСТЕРНИ БЛОКИРОВКИ ПЕРЕДНЕГО МОСТА HOVER  - 2300235-K01";1;117.08
" 2310012K01 ";"GREAT WALL ";" ШЕСТЕРНЯ БЛОКИРОВКИ ПЕРЕДНЕГО МОСТА HOVER";1;1266.19

What annoys me is that in one case only the name of the nomenclature is wrapped in quotation marks, and in the other - also the article and the manufacturer.
I tried to look at the type of the variable with the manufacturer: gettype($key['maker']) - gives out that in all cases string, but why the hell is string wrapped in quotes in one case, and not in the other?
I don't understand what's the problem?
UPD: figured it out! I noticed that in one case there are quotes and a space in the file, in the other - just quotes. I saw that when dividing the string, I did not get rid of the space. the trim function removed the spaces and solved the problem