PHP Out of class pdo connection fails - php

Question

I can not make the PDO connection outside the class. Browser gives 500 error. I want to write PDO codes in out class. I am doing global change, but it is not.
try {
$pas = new PDO('mysql:host=localhost; dbname=tets', 'root', '123');
$pas->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
$pas->exec("SET CHARACTER SET utf8"); // return all sql requests as UTF-8
} catch (Exception $e) {
echo $e->getMessage();
}
/**
User Avatar Check
**/
class Usercheck
{
public $sql , $paso;
public function __construct()
{
global $pas;
$this->paso =& $pas;
}
public function smf_members($whatid)
{
$this->sql = $this->paso->query("SELECT * FROM smf_members WHERE id_member = $whatid");
}
public function fetchcheck(){
if ($this->sql) {
return $this->sql->fetch(PDO::FETCH_BOTH);
}
}
}
$memberuser = new Usercheck();
$memberuser->smf_members('1');

Answer 1

It is not a good practice to use $global. There are many solutions to achieve what you want to do, and here is my approach.
1) Create a Connection Class to handle the PDO connectivity.
use PDO;
/**
* PDO Connection Classes
* Used by Database wrapper class to ensure that there is only one connection
*/
class Connection
{
private $dsn = 'mysql:host=' . DB_HOST . ';dbname=' . DB_NAME. ';charset=' . DB_CHARSET;
private $conn;
private $error;
public function __construct()
{
try
{
$this->conn = new PDO($this->dsn, DB_USER, DB_PASSWORD);
}
catch(PDOException $e)
{
$this->error = $e->getMessage();
}
}
public function getConnection()
{
return $this->conn;
}
}
2) Establish the PDO connection via your wrapper class __construct(), the __construct() also ensure that there is only one PDO connection is instantiated.
use PDO;
class UserCheck
{
private $conn;
private $db;
public function __construct()
{
if (!$this->db) {
$conn = new Connection();
$this->db = $conn->getConnection();
}
}
}
I'm highly recommend that you read this PDO tutorial on how to use PDO and many best practice tips.