after server update to php 7.2 i got different errors

hi there our server had been upgraded to php 7.2 and now i got different errors on my page

Deprecated: Function create_function() is deprecated in /domains/evinx.nl/htdocs/www/wp-content/themes/orizon/widgets/ratingpopular-widget.php on line 195

add_action('widgets_init', create_function('', 'return register_widget("PopularWidget");'));

and

Fatal error: Cannot redeclare post_templates_plugin_init() (previously declared in domains/evinx.nl/htdocs/www/wp-content/themes/orizon/post_templates.php:116) in domains/evinx.nl/htdocs/www/wp-content/themes/orizon/post_templates.php on line 117

function post_templates_plugin_init() {
	new Single_Post_Template_Plugin;
}