致命错误:调用第9行未定义的方法PDO::select() - Fatal error: Call to undefined method PDO::select() in line 9

Fatal error: Call to undefined method PDO::select() in line 9

我的网站发生了一些奇怪的事情。一切工作完美，现在我得到这个错误，当我试图登录:

致命错误:调用第9行未定义方法PDO::select()

下面是我的代码:

<?php
$db = new PDO('mysql:host=****;dbname=******;charset=utf8', '*****', '*****');
if($_SERVER["REQUEST_METHOD"] == "POST")
{
// username and password sent from Form
$myusername = $_POST['username'];
$mypassword = $_POST['password'];
$result = $db->select("SELECT userID FROM miembros WHERE user='$myusername' and  pass='$mypassword' AND confirm IS NULL");
$row = $result->fetch(PDO::FETCH_ASSOC);
$count = $result->rowCount();
// code continues
?>

我在第9行和$db做错了什么?

您想使用PDO::prepare准备语句，然后使用execute

  $db = new PDO('mysql:host=****;dbname=******;charset=utf8', '*****', '*****');
  if($_SERVER["REQUEST_METHOD"] == "POST")
  {
    // username and password sent from Form
    $prepared = array(
      'username' => $_POST['username'],
      'password' => $_POST['password']);
    $stmt = $db->prepare("SELECT userID FROM miembros WHERE user=:username and  pass=:password AND confirm IS NULL");
    $result = $stmt->execute($prepared);
    $row = $result->fetch(PDO::FETCH_ASSOC);
    $count = $result->rowCount();
  }