private final function __construct($DI)
{
if (Registry::Exists(get_called_class())) {
throw new Exception(sprintf('An instance of %s already exists', get_called_class()));
}
static::initialize($DI);
}
if (Registry::exists('key')) {
// do something
} else {
// key does not exist
}
if (Registry::exists('key')) {
Registry::delete('key');
}
The code examples use the PHP Registry pattern which is implemented in many PHP packages and libraries, such as the Symfony DependencyInjection component or the Zend Framework. private final function __construct($DI)
{
if (Registry::Exists(get_called_class())) {
throw new Exception(sprintf('An instance of %s already exists', get_called_class()));
}
static::initialize($DI);
}
