Почему не выводятся значения из MySQL?

Question

[r3dmist]

есть три файла:
config.php

<?php

class config {
	public $host = "localhost";
	public $user = "root";
	public $password = "";
	public $dbname = "test";
}
?>

файл db.php - для подключения к базе

<?php
require_once "config.php";

class db extends config {
	private $connection;
	public static $mysqli = null;

	function __construct() {
		$this->open_connection();
		$this->connection->query("SET NAMES 'utf8'");
		//echo "OK";
	}

	private function open_connection() {
		$this->connection = $mysqli = new mysqli($this->host, $this->user, $this->password, $this->dbname);
			if ($mysqli->connect_error) {
    		die('Connect Error (' . $mysqli->connect_errno . ') ' . $mysqli->connect_error);

}
	}

	public static function getObject() {
		if(self::$mysqli) {
			$obj = new db();
			self::$mysqli = $obj->connection;
		}
		return self::$mysqli;
	}
}

$db = new db();

?>

файл home.php - файл - вывод

<?php
require_once "classes/db.php";
$mysqli = db::getObject();

$sql = "SELECT content FROM pages";

$result = $mysqli->query($sql);

if($result && $result->num_rows > 0) {
	$row = $mysqli->assoc($result);
	do
	{
		echo $row['content'];
	}
	while($row = $mysqli->assoc($result));
}
	else {
		echo "<p>Пустой контент</p>";
	}


?>

выдает ошибку: Call to a member function query() on a non-object in home.php on line 7
вот этот лайн: $result = $mysqli->query($sql);

Answer 1

[Mikh Solovyev]

+ в файле home.php

<?
	require_once "classes/db.php";
	$mysqli = db::getObject();

	$sql = "SELECT content FROM pages";

	$result = $mysqli->query($sql);

	if($result && $result->num_rows > 0) {
	  while($row = $result->fetch_assoc()) echo $row['content'];  	
	} else {
	    echo "<p>Пустой контент</p>";
	}