PHP array element has value but is null - php

Question

I run into a weird issue today. Here is the var dump of my array
And here is my code
var_dump($file_line);
var_dump($file_line['Name']);
Although the array has element "Name" and this element has value, var_dump the element gives NULL
I don't understand what happened. Can anyone help?
To reproduce the issue you need to have this csv lines
Name,Email,Financial Status,Paid at,Fulfillment Status,Fulfilled at,Accepts Marketing,Currency,Subtotal,Shipping,Taxes,Total,Discount Code,Discount Amount,Shipping Method,Created at,Lineitem quantity,Lineitem name,Lineitem price,Lineitem compare at price,Lineitem sku,Lineitem requires shipping,Lineitem taxable,Lineitem fulfillment status,Billing Name,Billing Street,Billing Address1,Billing Address2,Billing Company,Billing City,Billing Zip,Billing Province,Billing Country,Billing Phone,Shipping Name,Shipping Street,Shipping Address1,Shipping Address2,Shipping Company,Shipping City,Shipping Zip,Shipping Province,Shipping Country,Shipping Phone,Notes,Note Attributes,Cancelled at,Payment Method,Payment Reference,Refunded Amount,Vendor,Outstanding Balance,Employee,Location,Device ID,Id,Tags,Risk Level,Source,Lineitem discount,Tax 1 Name,Tax 1 Value,Tax 2 Name,Tax 2 Value,Tax 3 Name,Tax 3 Value,Tax 4 Name,Tax 4 Value,Tax 5 Name,Tax 5 Value,Phone
ughh12551,test,refunded,11/20/2017 11:15,unfulfilled,,no,USD,36.99,2.99,0,39.98,,0,Flat Rate,11/20/2017 11:15,1,Jessica Curry - 'So Let Us Melt: Official Soundtrack' [(Blue & Orange) Vinyl LP],36.99,0,BSR025LP,TRUE,TRUE,pending,Molly Vu,2933 Fairmont Street,2933 Fairmont Street,,,Falls Church,'22042,VA,US,,Molly Vu,2933 Fairmont Street,2933 Fairmont Street,,,Falls Church,'22042,VA,US,,11/20/17: Voided at customer's request.,,11/20/2017 11:39,PayPal Payflow Pro,c165457068047.1,39.98,Black Screen Records,0,,,,1.04859E+11,,Low,web,0,,,,,,,,,,,
Then my complete code is
$header = NULL;
$data = array();
$files = array(
'orders_export_2.csv',
);
foreach ($files as $file) {
if (($handle = fopen(dirname(__FILE__) . '/ughh/' . $file, 'r')) !== FALSE)
{
while (($row = fgetcsv($handle, 0, ",")) !== FALSE) {
if (!$header) {
$header = $row;
} else {
$data[] = array_combine($header, $row);
}
}
fclose($handle);
}
}
foreach ($data as $key => $file_line) {
var_dump($file_line);
print_r($file_line);
var_dump($file_line['Name']);
}