PHP array with value returns NULL

Question

I have an array which is converted from CSV file. I have there two keys ID and NAME.

If I show key NAME everything is OK. But when i tried to get key ID, i always get NULL but key ID have value set.

function convertCsvToArray($filename='', $delimiter=';')
{
  if(!file_exists($filename))
    return FALSE;

  $header = NULL;
  $data = array();
  if (($handle = fopen($filename, 'r')) !== FALSE)
  {
    while (($row = fgetcsv($handle, 1000, $delimiter)) !== FALSE)
    {
      if(!$header)
        $header = $row;
      else
        $data[] = array_combine($header, $row);
    }
    fclose($handle);
  }
  return $data;
}

$array = convertCsvToArray('/path/to/csv/categories.csv',';');

/*
$array structure is
  array(2){
    ["ID"] => 3
    ["NAME"] => Some name
  }
*/
foreach($array as $category){
  var_dump($category["ID"]); //return NULL
  var_dump($category["NAME"]); //return "Some name"
}

CSV dump

ID;NAME
3;Značkové nealko nápoje
4;Nízkoenergetické nápoje
5;Minerálne vody, sóda
6;Tetrapack 0.2l a 0.5l

print_r for $array

Array
(
    [0] => Array
        (
            [ID] => 3
            [NAME] => Značkové nealko nápoje
        )

    [1] => Array
        (
            [ID] => 4
            [NAME] => Nízkoenergetické nápoje
        )
)

print_r for $category

Array
(
    [ID] => 3
    [NAME] => Značkové nealko nápoje
)

Answer 1

The problem here comes from BOM.

Invisible characters are added at the begining of the file, so they are prefixed to the "ID" key, so PHP can't find the ID key, and shows NULL values.

Convert your CSV file to UTF-8 without BOM and it will fix your problem.