Errror when accessing gome page

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<?php 
final class DBMySQLi { 
	private $link; 

	public function __construct($hostname, $username, $password, $database) { 
		$this->link = new mysqli($hostname, $username, $password, $database); 
	
		if (mysqli_connect_error()) { 
			throw new ErrorException('Error: Could not make a database link (' . mysqli_connect_errno() . ') ' . mysqli_connect_error()); 
		} 
	
		$this->link->set_charset("utf8"); 
	} 

	public function query($sql) { 
		$query = $this->link->query($sql); 
	
		if (!$this->link->errno) { 
			if (isset($query->num_rows)) { 
				$data = array(); 
	
				while ($row = $query->fetch_assoc()) { 
					$data[] = $row; 
				} 
	
				$result = new stdClass(); 
				$result->num_rows = $query->num_rows; 
				$result->row = isset($data[0]) ? $data[0] : array(); 
				$result->rows = $data; 
	
				unset($data); 
	
				$query->close(); 
	
				return $result; 
	
			} else { 
				return true; 
			} 
	
		} else { 
			throw new ErrorException('Error: ' . $this->link->error . '<br />Error No: ' . $this->link->errno . '<br />' . $sql); 
			exit(); 
		} 
	} 

	public function escape($value) { 
		return $this->link->real_escape_string($value); 
	} 

	public function countAffected() { 
		return $this->link->affected_rows; 
	} 

	public function getLastId() { 
		return $this->link->insert_id; 
	} 

	public function __destruct() { 
		$this->link->close(); 
	} 
} 
?>

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// DB
define('DB_DRIVER', 'mysql');

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// DB
define('DB_DRIVER', 'mysqli');