Online PHP editor | output for GE5F4

<?php if ($_SERVER['REQUEST_METHOD'] == "POST") { $sql = mysqli_query($c, "SELECT username,password FROM personeel,administrators WHERE username='".mysqli_real_escape_string($c, $_POST['username'])."'AND password='".mysqli_real_escape_string($c, sha1($_POST['password']))."'") ; if ($sql == TRUE) { setcookie("username", $_POST['username'], time()+1800); setcookie("loggedin", TRUE, time()+1800); unset ($_POST); Header ("Location: landing.php"); } else { echo mysqli_error($c); //Hier straks: "Gegevens niet gevonden" van maken } //Sluit COOKIE/REDIRECT/SQL maken af } //sluit IF METHOD POST ?>