PHP Database Connection

database-connection.php

<?php
class Database{
	private $host;
	private $username;
	private $password;
	private $database;

	private $conn;

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

		$this->connect();
	}
	public function connect(){
		try{
			
			$this->conn = new PDO('mysql:host=' . $this->host . ';dbname=' . $this->database, $this->username, $this->password);

		} catch(PDOException $e){
		    print "Error!: " . $e->getMessage() . "<br/>";
		    die();
		}
	}
	public function runSQL($query, $params=null){
		try {
			$statement = $this->conn->prepare($query);
			$statement->execute($params);
			return true;
		} catch (PDOException $e) {
			print "Error" . $e->getMessage();
		}
	}
	
	// more functions here
	
}
?>