fputcsv

[Clarissa]

I want to parse, process and then overwrite only 1 specific column in a csv file, I'm fine with the first two steps but am having issues with the third. Here's what I have so far:

<?php
$fh = fopen("data.csv", "r");
$row = 1;
while (($data = fgetcsv($fh, 1024, ",")) !== FALSE) {
$get = $data[2];
$uc = ucwords(strtoupper($get));
echo $uc;
echo "</br>";
}
?>

That displays fine, I just need it to be written back into it's original column. I know this is done with fputcsv, but I can't seem to get it to work:

$fp = fopen('data.csv', 'w');
fputcsv($fp, $uc, ",");
fclose($fp); 

That wipes the file.