<?php
session_start();
include("config.php");
$dbh = new PDO($dbstr);

$id = $_POST["id"];
$dir=$_POST["dir"];
$arrivee=$_POST["arrivee"];

$stm=$dbh->prepare("SELECT depart FROM hob_dir WHERE depart = ? AND direction = ?");
$stm->execute([$id, $dir]);

if ($row = $stm->fetch()) {
    $stm = $dbh->prepare("UPDATE hob_dir SET arrivee = ? WHERE depart = ? AND direction = ?");
    $stm->execute([$arrivee, $id, $dir]);
} else {
    $stm = $dbh->prepare("INSERT INTO hob_dir(depart, direction, arrivee) VALUES (?,?,?)");
    $stm->execute([$id,$dir,$arrivee]);
}

header("Location: locdetail.php?id=$id");