Kohana - display buffered views or custom view on shutdown - php

Question

I am using Kohana View_Core derivative for my views. I would like to display buffered views or custom view on shutdown e.g.
If there were some errors/exceptions during the runtime => display error page
If executed with no errors => display the buffered output
The View
class View
{
private $file = '';
private $data = array();
private static $global_data = array();
public static $view = '';
private function __construct($file = FALSE, array $data = array())
{
if ($file !== FALSE)
{
$this->set_filename($file);
}
if (!empty($data))
{
$this->data = $data + $this->data;
}
}
/**
* Creates new view object and returns it.
*
* #param string filename
* #param array variables
* #return object View
*/
public static function factory($file = FALSE, array $data = array())
{
return new View($file, $data);
}
/**
* Captures the output that is generated when a view is included.
* The view data will be extracted to make local variables. This method
* is static to prevent object scope resolution.
*
* #param string filename
* #param array variables
* #return string
*/
public static function capture($view_filename, array $view_data)
{
extract($view_data, EXTR_SKIP);
ob_start();
try
{
require $view_filename;
}
catch (Exception $error)
{
$ob_handlers = ob_list_handlers();
if (!empty($ob_handlers))
{
ob_end_clean();
}
throw $error;
}
return ob_get_clean();
}
/**
* Load view file
*
* #param string filename
* #return boolean
* #return object View
*/
public function set_filename($file)
{
if (strpos($file, APP_DIR) === FALSE)
{
$extension = strrpos($file, '.') === FALSE ? '.php' : '';
$path = APP_DIR.DIR_SEP.'system'.DIR_SEP.'views'.DIR_SEP.$file.$extension;
}
else
{
$path = $file;
}
if (!file_exists($path))
{
Error::throw_throwable('Unable to find file '.$path);
}
$this->file = $path;
return $this;
}
/**
* Sets a global variable, similar to the set() method.
*
* #param string variable name
* #param mixed variable value
* #return object View
*/
public static function set_global($key, $value = FALSE)
{
self::$global_data[$key] = $value;
}
/**
* Assigns a variable by name.
*
* #param string variable name or an array of variables
* #param mixed variable value
* #return object View
*/
public function set($key, $value = FALSE)
{
if (is_array($key))
{
foreach ($key as $name => $value)
{
$this->data[$name] = $value;
}
}
else
{
$this->data[$key] = $value;
}
return $this;
}
/**
* Renders the view object to a string.
*
* #throws exception
* #param string filename
* #return string
*/
public function render($file = FALSE)
{
if ($file !== FALSE)
{
$this->set_filename($file);
}
if (empty($this->file))
{
Error::throw_throwable('Unable to find file '.$this->file);
}
$data = array_merge(View::$global_data, $this->data);
return View::capture($this->file, $data);
}
public function __toString()
{
try
{
$result = $this->render();
return $result;
}
catch (Exception $error)
{
Error::throw_throwable($error);
}
}
public function __set($key, $value)
{
$this->set($key, $value);
}
public function __get($key)
{
return isset($this->data[$key]) ? $this->data[$key] : FALSE;
}
}
Usage
$content = View::factory('main/Main')
->set('order', !empty($_SESSION['order']) ? $_SESSION['order'] : FALSE)
->set('order_success', $order_success)
->set('items', $items)
->set('weights', $weights)
->set('ammounts', $ammounts)
->set('prices', $prices)
->set('total_price', $total_price)
->set('validator', FALSE)
;
$template = $this->get_template();
echo $template->set('content', $content);
What the previous lines do is echo a content view inside of template view. And this should be also the result that my shutdown handler is echoing if necessary. Is there a nice/easy way to do this?

Answer 1

It sounds like what you want is to show a custom error page when there is an error. What I typically do here is to extend Kohana_Kohana_Exception class (as Kohana_Exception) and override the public static function handler method.
This lets you put in some code that can check what the error is (HTTP_404_Exception or other) what the environment is (dev / production) and do whatever behavior you want.
In my case, something like this:
// If not production and not an HTTP exception
if ( ! ($e instanceof HTTP_Exception) && Kohana::$environment !== Kohana::PRODUCTION)
{
// Use built in error handler to show stace trace for developers
Kohana_Kohana_Exception::handler($e);
// ... exit(1);
}
// Otherwise
$injected_routes = array(Route::get('error'));
echo Request::factory('error-uri', NULL, FALSE, $injected_routes)
->headers(Request::$initial->headers())
->execute()
->send_headers(TRUE)
->body();
Here you need another route called error that matches error-uri and goes to another error controller/action/view that you can use to render your custom error page.
For this to work you need to have errors enabled by passing 'errors' => TRUE to your Kohana::init call in bootstrap.php.