check index of columns in key of an array and remove columns with value 0

I have a php code that takes the matched rows of a csv file and puts them in an array. my csv file looks like this:

Company,Produkt,Sortiment name,31,32,33,34,35,36,37,38 //these are shoe sizes
Dockers,AD1234,Sort A,2,3,5,3,2,1,0,0  //and these numbers are how many pairs of shoes
Addidas,AB1234,Sort B,2,2,1,4,,0,0,4,3
Nike,AC1234,Sort C,0,2,0,1,4,0,4,3
Dockers,AE1234,Sort D,0,1,2,3,4,1,0,2

and my php code is

$csv = file_get_contents($_SERVER['DOCUMENT_ROOT'] . 'CsvTest/Sortiment.csv');

    $input = 'Company'; // column
    $value = 'Dockers'; // what value of that column

    $csv = array_map("str_getcsv", explode(PHP_EOL, $csv));
    $keys = array_shift($csv);
    $key = array_search($input, $keys);

    $sortiment_array = array();
    while ($line = array_shift($csv)) {
        if ($line[$key] == $value) {
            $line = implode(',', $line) . PHP_EOL;
            $sortiment_array[] = $line;
        }
    }

so var_dump($sortiment_array); will give me the following

array(2) {
  [0]=>
  string(39) "Dockers,AD1234,Sort A,2,3,5,3,2,1,0,0"
  [1]=>
  string(39) "Dockers,AE1234,Sort D,0,1,2,3,4,1,0,2"
}

What I would like to do is to have the 0 columns taken out from the array and so therefore I need to identify what pair of shoes was not 0 ? So I need the first row (which is the header for my case) to repeat itself for each key and take out the shoe size that had 0 pairs. basically my array should turn into something like:

array(2) {
  [0]=>array(2)
       ['shoe size']=> "Producer,Produkt,Sortiment name,31,32,33,34,35,36" // no 37,38 
       ['sortiment']=> "Dockers,AD1234,Sort A,2,3,5,3,2,1,"// no 0
  [1]=>array(2)
       ['shoe size']=> "Producer,Produkt,Sortiment name,32,33,34,35,36,38" // no 31, 37 
       ['sortiment']=> "Dockers,AE1234,Sort D,1,2,3,4,1,2" 
}

Basically in ‘shoe size’ sizes should be taken out where the matched row has 0 pairs for that size. I hope I can explain it. I tried my best. Any suggestions?

Answer

If all the rows in the data are the same size, you can combine the keys and values for each line that matches, then filter that to remove the zeros.

while ($line = array_shift($csv)) {
    if ($line[$key] == $value) {

        // combine keys and values, and filter to remove zeros
        $filtered = array_filter(array_combine($keys, $line));

        // separate the resulting keys and values and add them to your output array
        $sortiment_array[] = [
            'shoe size' => implode(',', array_keys($filtered)),
            'sortiment' => implode(',', $filtered)
        ];
    }
}