<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "sakila";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// prepare and bind
$stmt = $conn->prepare("SELECT * FROM customers WHERE last_name=VALUES (?)");
$stmt->bind_param("s", $last_name);

// set parameters and execute
$last_name =  $_POST["last_name"];

$result = $stmt->execute();

if ($result->num_rows > 0) {
    // output data of each row
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "<br>";
    }
} else {
    echo "0 results";
}

$stmt->close();
$conn->close();

?>