PDO Not Found in Class

I use the Slim Framework Skeleton and followed the user guide to get started. As part of guide i created a db container in the dependencies.php

    $container['db'] = function ($c) {
    $settings = $c->get('settings')['db'];
    $pdo = new PDO("mysql:host=" . $settings['host'] . ";dbname=" . $settings['dbname'],
        $settings['user'], $settings['pass']);
    return $pdo;

now i can call stuff like this on my routes page which works fine

`$result  = $this->db->query("CALL user_info.`sp_user_login`('$userid', '$passwd')");`

but as this is not the best way i would like to move some db functions in to classes which i will call from my routes page like this

    $app->get('/test', function (Request $request, Response $response, array $args) {
    $blackObj = new Security\BlackList($this->db);
    $Success = $blackObj->check_token($_SERVER['REMOTE_ADDR']);
    echo $Success;

the below code runs fine on the routes page but fails in my class

    public function check_token($ip)
      $sth = $this->db->prepare('CALL `user_info`.`sp_ip_blacklist`(?)');
      $sth->bindParam(1, $IP, PDO::PARAM_STR, 20);
      $todos = $sth->fetchAll();

      return count($todos);

The error i am getting is

Type: Error Message:
Class ‘Security\PDO’ not found File: /var/www/html/api/src/Security/BlackList.php
Line: 46

So how do i make PDO known in my class, i inject the $this->db when calling my function but i guess thats not enough

Are you importing PDO in your class? Is it namespaced?

use PDO;
// ...
$sth->bindParam(1, $IP, \PDO::PARAM_STR, 20);

Nope i did not as i thought using the db which is a PDO object would be good enough. But yes adding use pdo to my class did the trick.

You need use PDO because of the line above that you have in your class, or you can do \PDO::PARAM_STR, but this would mean doing it multiple places if you use a PDO constant anywhere else.

By adding use pdo I was able to use the PDO::PARM_STR without the slash

Also is there a way to get access to the db which I created in the dependencies.php without injecting it in the call to the function ?

Passing it to the class’s constructor from the container is the preferred way.

Not to sound like a newbee to Slim OOP (which i am) can you provide a sample or link to one ?

This is how i do it right now hope thats what you mean …

$app->get('/black', function (Request $request, Response $response, array $args) {
$ipAddress = $request->getAttribute('ip_address');
$blackObj = new Security\BlackList($this->db);
$Success = $blackObj->check_ip_blacklist($ipAddress);
if ($Success == 1)
  echo "user on black list";
  else {
   echo "Your Ip ".$ipAddress." is not blacklisted";

And my class look like this now

namespace Security;
use pdo;

final class BlackList
public $db;

public function __construct($db) {
	$this->db = $db;

public function check_token($ip)
  $sth = $this->db->prepare('CALL `user_info`.`sp_ip_blacklist`(?)');
  $sth->bindParam(1, $ip, PDO::PARAM_STR, 20);
  $todos = $sth->fetchAll();

  return $todos;

You are pretty much doing it by passing $this->db to your class. So it is clear that your class needs the db in order to function. There is a good overview of this here Dependency Injection Factories for Slim Controllers with some code examples.

Namespaces may be case-insensitive, but autoloaders most often do. Write use PDO; instead.