database.php

<?php

class database
{
    private $host;
    private $db_name;
    private $username;
    private $password;
    public $conn;

    public function __construct($host, $db_name, $username, $password)
    {
        $this->host = $host;
        $this->db_name = $db_name;
        $this->username = $username;
        $this->password = $password;
    }

    public function getConnection()
    {
        $this->conn = null;

        try {
            $this->conn = new PDO(
                "mysql:host={$this->host};dbname={$this->db_name}",
                $this->username,
                $this->password
            );
            $this->conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        } catch (PDOException $exception) {
            echo "Connection error: " . $exception->getMessage();
        }

        return $this->conn;
    }
}