Problem with Hard Returns in CSV Export

[ShorStew]

The code below has been working on my site for almost three years, until recently. Now the resulting CSV has unwanted rows where there is a hard return in one of fields. I am not sure if this is due to a change in settings (I'm on a shared server) or a new version of PHP (currently 5.1.6).

 

Any thoughts? Thanks in advance.

 

<?php

require ('./includes/mysql_connect.php');


$select = stripslashes($_GET['selection']);
$export = mysql_query($select);
$fields = mysql_num_fields($export);
$header = '';
$data = '';

for ($i = 0; $i < $fields; $i++) {
    $header .= mysql_field_name($export, $i) . "\t";
}


while($row = mysql_fetch_row($export)) {
    $line = '';
    foreach($row as $value) {
        if ((!isset($value)) OR ($value == "")) {
            $value = "\t";
        } else {
            $value = str_replace('"', '""', $value);
            $value = '"' . $value . '"' . "\t";
        }
        $line .= $value;
    }
    $data .= trim($line)."\n";
}
$data = str_replace("\r","",$data);

if ($data == "") {
    $data = "\n(0) Records Found!\n";
}

header("Content-type: application/x-msdownload");
header("Content-Disposition: attachment; filename=export.xls");
header("Pragma: no-cache");
header("Expires: 0");
print "$header\n$data";

mysql_free_result($export);

mysql_close();

?>