PHP Script - Mysql to CSV

<?php
$host = 'localhost';
$user = 'user';
$pass = 'pass';
$db = 'clients';
$table = 'names';
$file = 'backup';

$link = mysql_connect($host, $user, $pass) or die("failed to connect." . mysql_error());
mysql_select_db($db) or die("failed to connect.");

$result = mysql_query("SHOW COLUMNS FROM ".$table."");
$i = 0;
if (mysql_num_rows($result) > 0) {
while ($row = mysql_fetch_assoc($result)) {
$names_output .= $row['Field'].", ";
$i++;
}
}
$names_output .= "\n";

$values = mysql_query("SELECT * FROM ".$table."");
while ($rowr = mysql_fetch_row($values)) {
for ($k=0;$k<$i;$k++) {
$names_output .= $rowr[$k].", ";
}
$names_output .= "\n";
}

$filename = $file."_".date("Y-m-d_H-i",time());
header("Content-type: application/vnd.ms-excel");
header("Content-disposition: csv" . date("Y-m-d") . ".csv");
header( "Content-disposition: filename=".$filename.".csv");
print $names_output;
exit;
?>