<?php

$connect = mysqli_connect("localhost", "root", "", "ticket");
$query = "SELECT * FROM `" .$_POST['bdd'] ."`";
$title = array_keys(mysqli_fetch_assoc(mysqli_query($connect, $query)));

header('Content-Type: text/csv; charset=utf-8');
header('Content-Disposition: attachment; filename=' .$_POST['bdd'] .'.csv');
$output = fopen("php://output", "w");
fputcsv($output, $title);
$result = mysqli_query($connect, $query);
while($row = mysqli_fetch_assoc($result)) {
    fputcsv($output, $row);
}
fclose($output);
?>