class HandlerManager
{
    public function register()
    {
        set_exception_handler([$this, 'exception']);
        set_error_handler([$this, 'error']);
        register_shutdown_function([$this, 'shutdown']);
    }
    
    private function log($error, $code, $file, $line)
    {
        $error = sprintf('Error %s in file %s[%d]: %s', $code, $file, $line, $error);
        return error_log($error);
    }
    
    public function exception(\Throwable $e)
    {
        $this->log($e->getMessage(), $e->getCode(), $e->getFile(), $e->getLine());
        // clean the output buffer if one exists
        ob_get_level() && ob_clean();
        header('Content-Type: text/plain; charset=utf-8', true, 500);
        echo $e->getMessage();
        exit(1);
    }
    
    public function error($severity, $error, $file = '', $line = 0)
    {
        if (error_reporting() & $severity) {
            $this->log($error, $severity, $file, $line);
            throw new \ErrorException($error, $severity, $file, $line);
        }
        // dont execute the PHP error handler
        return true;
    }

    public function shutdown(array $shutdown_errors = [E_PARSE, E_ERROR, E_USER_ERROR])
    {
        $error = error_get_last();
        if ($error && in_array($error['type'], $shutdown_errors)) {
            // сlean the output buffer
            ob_get_level() && ob_clean();
            $this->log($error['message'], $error['type'], $error['file'], $error['line']);
            // shutdown now to avoid a "death loop"
            exit(1);
        }
    }
}

class XmlConverter
{
	/**
	 * Conver array in xml
	 */
	public function as_array(array $data, $xml = NULL)
	{
		if (is_null($xml))
		{
			$xml = simplexml_load_string('<'.key($data).'/>');
			$data = current($data);
			$return = TRUE;
		}
		if (is_array($data))
		{
			foreach ($data as $name => $value)
			{
				self::from_array($value, is_numeric($name) ? $xml : $xml->addChild($name));
			}
		}
		else
		{
			$xml->{0} = $data;
		}
		if ( ! empty($return))
		{
			return $xml->asXML();
		}
	}

	/**
	 * Conver xml in array
	 */
	public function to_array($xml)
	{
		$tree = NULL;
		while($xml->read())
		{
			switch ($xml->nodeType)
			{ 
				case XMLReader::END_ELEMENT: 
					return $tree; 
				case XMLReader::ELEMENT: 
					$node = array(
						'tag'   => $xml->name, 
						'value' => $xml->isEmptyElement ? '' : self::to_array($xml)
					); 
					if ($xml->hasAttributes) 
					{
						while ($xml->moveToNextAttribute())
						{
							$node['attributes'][$xml->name] = $xml->value;
						}
					}
					$tree[] = $node; 
				break; 
				case XMLReader::TEXT:
				case XMLReader::CDATA:
					$tree .= $xml->value; 
			}
		}
		return $tree; 
	}
}