myClass.php

<?php

class myClass
{
	public $db = '';
	private $host = 'localhost'; 
	private $dbname = 'card'; 
	private $dbuser = 'root'; 
	private $dbpass = '';  


	function __construct()
	{
		// While Class Init. This will connect database.
		try
		{
			$this -> db = new PDO('mysql:host='.$this->host.';dbname='.$this->dbname.';charset=utf8',$this->dbuser,$this->dbpass);
		}
		catch (PDOException $e) 
		{
			var_dump($e->getMessage());
			die();
		}
	}


	public function query()
	{
		$query = $this->db -> prepare("SELECT * FROM client");
		$query -> execute();
		return $query -> fetchAll();
	}
}


// Testing
$test = new myClass();
$data = $test -> query();
var_dump($data);
?>