autocomplete return '0 results' - php

Question

recently started coding, tried to use prepared statements for the first time, but it's returning '0 results' and I can't find the error.
Autocomplete was working without prepared statements, but don't know where I'm going wrong now.
<?php
$dbServername = "localhost";
$dbUsername = "root";
$dbPassword = "";
$dbName= "vlucht";
$mysqli = mysqli_connect($dbServername, $dbUsername, $dbPassword, $dbName);
mysqli_set_charset($mysqli, 'utf8');
$id = $_GET['q'];
$disc = "%" . strtolower($id) . "%";
$sql = "SELECT DISTINCT postgemeente FROM overzicht WHERE LOWER (postgemeente) LIKE ?";
$stmt = $mysqli->prepare($sql);
$stmt->bind_param("s", $disc);
$stmt->execute();
$result = $mysqli->query($sql);
if ($result->num_rows > 0) {
while($row = $result->fetch_assoc()) {
echo $row["postgemeente"]. "\n";
}
} else {
echo "0 results";
}
$mysqli->close();
?>

Answer 1

If you are using prepare->bind->execute ..... you need to remove this line
$result = $mysqli->query($sql);
See comments
<?php
// help with debugging
ini_set('display_errors', 1);
ini_set('log_errors',1);
error_reporting(E_ALL); mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$dbServername = "localhost";
$dbUsername = "root";
$dbPassword = "";
$dbName= "vlucht";
$mysqli = mysqli_connect($dbServername, $dbUsername, $dbPassword, $dbName);
mysqli_set_charset($mysqli, 'utf8');
$id = $_GET['q'];
$disc = "%" . strtolower($id) . "%";
$sql = "SELECT DISTINCT postgemeente FROM overzicht WHERE LOWER (postgemeente) LIKE ?";
$stmt = $mysqli->prepare($sql);
$stmt->bind_param("s", $disc);
$stmt->execute();
// remove you are doing it differently now
//$result = $mysqli->query($sql);
// add to get a result object from a statement object
$result = $stmt->get_result();
if ($result->num_rows > 0) {
while($row = $result->fetch_assoc()) {
echo $row["postgemeente"]. "\n";
}
} else {
echo "0 results";
}
$mysqli->close();
?>