Building the Back End: Part 1 - Realtime Web Apps: With HTML5 WebSocket, PHP, and jQuery - page 170

$this->view = $view;
}

/**
* Stores data for the view into an array
*
* @param $key string The variable name
* @param $var string The variable value
* @return void
*/
public function __set( $key, $var ) {
$this->vars[$key] = $var;
}

/**
* Loads and parses the selected template using the provided data
*
* @param $print boolean Whether the markup should be output directly
* @return mixed A string of markup if $print is TRUE or void
*/
public function render( $print=TRUE ) {
// Converts the array of view variables to individual variables
extract($this->vars);

// Checks to make sure the requested view exists
$view_filepath = SYS_PATH . '/views/' . $this->view . '.inc.php';
if (!file_exists($view_filepath)) {
throw new Exception("That view file doesn't exist.");
}

// Turns on output buffering if markup should be returned, not printed
if (!$print) {
ob_start();
}

require $view_filepath;

// Returns the markup if requested
if (!$print) {
return ob_get_clean();
}
}

}

■ You may have noticed that the View class isn't abstract. this is because its functionality doesn't need to be
extended in this app.

Note