<?
$authorization = $_SERVER["HTTP_AUTHORIZATION"];
$success = preg_match("/Basic ([a-zA-Z0-9\+\/=]+)/", $authorization, $matches);

$good_user = "Prueba";
$good_password = "123";

if($success) {
    $decoded = base64_decode($matches[1], true);
    $parts = explode(':',$decoded);
    $user = $parts[0];
    $password = $parts[1];
    if($user != $good_user || $password != $good_password){
        http_response_code(401);
    } else {
        echo "User: $user \nPassword: $password";
    }

} else {
    http_response_code(401);
}