+
+/**
+ * [is_get_request description]
+ * @return boolean [description]
+ */
+function is_get_request()
+{
+ if (filter_input(INPUT_SERVER, 'REQUEST_METHOD') === 'GET') {
+ return true;
+ } else {
+ return false;
+ }
+}
+
+/**
+ * [chk_account description]
+ * @param [type] $email [description]
+ * @return [type] [description]
+ */
+function chk_account($email)
+{
+ global $connection;
+ $sql_pquery = "select count(NumCl) from CLIENTS where EmailCl = ?";
+ $connection->prepare_query($sql_pquery);
+ $connection->prepared_query_bind_param("s", array($email));
+ $connection->run_prepared_query();
+ $connection->get_pquery_result();
+ $row = $connection->get_result_array();
+ $connection->close_prepared_query();
+ if (!empty($row[0][0])) {
+ return true;
+ } else {
+ return false;
+ }
+}
+
+/**
+ * [chk_password description]
+ * @param [type] $email [description]
+ * @param [type] $password [description]
+ * @return [type] [description]
+ */
+function chk_password($email, $password)
+{
+ global $connection;
+ $sql_pquery = "select PasswordCl from CLIENTS where EmailCl = ?";
+ $connection->prepare_query($sql_pquery);
+ $connection->prepared_query_bind_param("s", array($email));
+ $connection->run_prepared_query();
+ $connection->get_pquery_result();
+ $row = $connection->get_result_array();
+ $connection->close_prepared_query();
+ if (password_verify($password, $row[0][0])) {
+ return true;
+ } else {
+ return false;
+ }
+}
+
+/**
+ * [get_client_id description]
+ * @param [type] $email [description]
+ * @return [type] [description]
+ */
+function get_client_id($email)
+{
+ global $connection;
+ $sql_pquery = "select NumCl from CLIENTS where EmailCl = ?";
+ $connection->prepare_query($sql_pquery);
+ $connection->prepared_query_bind_param("s", array($email));
+ $connection->run_prepared_query();
+ $connection->get_pquery_result();
+ $row = $connection->get_result_array();
+ $connection->close_prepared_query();
+ return $row[0][0];
+}
+
+/**
+ * [nb_booked description]
+ * @param [type] $client_id [description]
+ * @param [type] $flight_id [description]
+ * @return [type] [description]
+ */
+function nb_booked($client_id, $flight_id, $class_name)
+{
+ global $connection;
+ $sql_pquery = "select sum(NbPlaces) from RESERVATIONS where NumCl = ? and NumVol = ? and Classe = ?";
+ $connection->prepare_query($sql_pquery);
+ $connection->prepared_query_bind_param("iss", array($client_id, $flight_id, $class_name));
+ $connection->run_prepared_query();
+ $connection->get_pquery_result();
+ $row = $connection->get_result_array();
+ $connection->close_prepared_query();
+ return $row[0][0];
+}
+
+/**
+ * [chk_logged_in description]
+ * @return [type] [description]
+ */
+function chk_logged_in()
+{
+ if (isset($_SESSION['email']) && isset($_SESSION['IP_address'])) {
+ return true;
+ } else {
+ return false;
+ }
+}
+
+/**
+ * [redirect description]
+ * @param [type] $url [description]
+ * @param [type] $delay [description]
+ * @return [type] [description]
+ */
+function redirect($url, $delay)
+{
+ header("refresh:$delay; url=$url");
+}
+