create OOP using foreach - wordpress

Question

I want to register widgets using foreach
$widgets['Gallery'] = array(
'title' => __('Gallery', 'redux-framework'),
'desc' => __('Creates a custom gallery', 'redux-framework'),
'fields' => array(
array(
'id' => 'ids',
'type' => 'gallery',
'title' => __('Add/Edit Gallery', 'redux-framework'),
'subtitle' => __('Create a new Gallery by selecting existing or uploading new images', 'redux-framework'),
),
)
);
$widgets['textblock'] = array(
'title' => __('Text Block', 'redux-framework'),
'desc' => __('Create a simple block text.', 'redux-framework'),
'fields' => array(
array(
'id' => 'content',
'type' => 'editor',
'title' => __('Content', 'redux-framework'),
'subtitle' => __('Enter some content for this textblock', 'redux-framework'),
),
)
);
foreach ($widgets as $class => $field) {
$class = str_replace('-', '_', $class);
class $class extends Cadr_Widget {
//the rest of methods here
}
if (class_exists($class))
register_widget($class);
}
is it possible to do some thing like this ??
I'm receiving error
Parse error: syntax error, unexpected T_VARIABLE, expecting T_STRING in C:\Dropbox\xampp\htdocs\theme\wp-content\themes\cadr-master\framework\builder\inc\core.php on line 424
without define class inside foreach , I must I write every class and I have a lot of widgets
class Gallery extends cadr_Widget {
/**
* Render the widget in frontend
*
* #param array $args
* #param array $instance
* #return bool|void
*/
function widget($args, $instance) {
//echo $instance['content'];
}
}