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

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname); // connect to DB

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Get Params from user
$username = $_GET['username'];
$password = $_GET['password'];

$sql = "SELECT username, password FROM users where username = '" . $username . "' and password = '" . $password . "'";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
	echo "logged in!";

    // output data of each row
    while($row  $result->fetch_assoc()) {
        echo "username: " . $row["username"];
    }
} else {
    echo "login failed";
}
$conn->close();
?>