remove_action_by_class - Remove actions that are created in WordPress by the add_action hook, but can't be removed with the remove_action hook because an instance of a class created the hook with no way to access it. Use to remove custom actions created by class instances.

remove-action-by-class.function.php

<?php
/**
 * Function remove_action_by_class
 * Used to remove notices and nags or other class actions added with class instances (unable to remove with remove_action)
 *
 * @param     $hook_name
 * @param     $class_and_function_list
 * @param int $priority
 * 
 * ex use case:
 * add_action( 'admin_head', array ( $this, 'remove_other_admin_nags' ) );
 * function remove_other_admin_nags(){
			remove_action_by_class('admin_notices', array('yoast'=>'admin_notices'));
		}
 */
function remove_action_by_class($hook_name, $class_and_function_list, $priority = 10) {
	global $wp_filter;
	// go through manually created class and function list
	foreach($class_and_function_list as $class_search => $function_search){
		//limit removals to matching action names (wildcard string matching)
		foreach($wp_filter[$hook_name][$priority] as $instance => $action){
			//limit removals again to matching class and function names (wildcard string matching)
			if( stristr($instance,$function_search) && stristr(get_class($action['function'][0]),$class_search) ) {
				//action found, removing action from filters
				unset($wp_filter[$hook_name][10][$instance]);
			}
		}
	}
}