Unable to post API Rest PHP SQLITE - php

Question

I'm looking for since few days to create a API Restful in PHP to add record on my sqlite database. But when I use POSTMAN to try it, my php code doesn't work, but it's work (with little modifies) with mysql databases.
Could you help me please ? (This code is just a test)
<?php
header('Content-Type: application/json');
try{
$pdo = new PDO('sqlite:database.db');
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$retour["success"] = true;
$retour["message"] = "Connexion OK";
} catch(Exception $e){
$retour["success"] = false;
$retour["message"] = "Connexion impossible";
}
if ( !empty($_POST["ville_depart"]) && !empty($_POST["ville_destination"]) && !empty($_POST["date"]) && !empty($_POST["nb_heure"]) && !empty($_POST["prix"]) ) {
$requete = $pdo->prepare('INSERT INTO api (id, ville_depart, ville_destination, date_depart, nb_heure_vol, prix) VALUES (?, :ville1, :ville2, :date_vol, :nb, :prix)');
$requete->bindParam(':ville1', $_POST["ville_depart"]);
$requete->bindParam(':ville2', $_POST["ville_destination"]);
$requete->bindParam(':date_vol', $_POST["date_depart"]);
$requete->bindParam(':nb', $_POST["nb_heure_vol"]);
$requete->bindParam(':prix', $_POST["prix"]);
$requete->execute();
$retour["success"] = true;
$retour["message"] = "add flight";
$retour["results"] = array();
} else {
$retour["success"] = false;
$retour["message"] = "manque infos";
}
echo json_encode($retour);
// close the database connection
$pdo = NULL;
?>
The result from POSTMAN is not really "speaking", but I can't to find other informations (in the log files) to help me...

Answer 1

[edit to be conform at the previous code]
I think my problem come from my "$_POST" because, when I tried to put some values into the "INSERT" line, that works well.
ex:
$requete = $pdo->prepare("INSERT INTO api (id,ville_depart, ville_destination, date_depart, nb_heure_vol, prix) VALUES ('123', 'LYON', 'TLS', '2019-09-09', '13', '132')");
$requete->execute();