Export Database to CSV File PHP Script

$host = 'localhost';
$user = 'mysqlUser';
$pass = 'myUserPass';
$db = 'myDatabase';
$table = 'products_info';
$file = 'export';

$link = mysql_connect($host, $user, $pass) or die("Can not connect." . mysql_error());

mysql_select_db($db) or die("Can not connect.");


$res = mysql_query("SELECT * FROM $table");

// fetch a row and write the column names out to the file
$row = mysql_fetch_assoc($res);
$line = "";
$comma = "";
foreach($row as $name => $value) {
    $line .= $comma . '"' . str_replace('"', '""', $name) . '"';
    $comma = ",";
}
$line .= "\n";
fputs($fp, $line);

// remove the result pointer back to the start
mysql_data_seek($res, 0);

// and loop through the actual data
while($row = mysql_fetch_assoc($res)) {
 
    $line = "";
    $comma = "";
    foreach($row as $value) {
        $line .= $comma . '"' . str_replace('"', '""', $value) . '"';
        $comma = ",";
     

    }
     $line .= "\n";
    fputs($fp, $line);
 
}

fclose($fp);
header('Content-type: application/csv');
header('Content-Disposition: attachment; filename="export.csv"');
readfile('export.csv');