Remove s2member roles from WordPress.

remove_s2member_roles.php

/*
	s2member doesn't remove the custom roles it creates when you deactivate or delete the plugin.
	This code will remove the custom roles. Steps:
	1. Add this code to your active theme's functions.php.
	2. Login as an administrator.
	3. Navigate to /?s2cleanup=1 to give any user with the s2member_level1 role the subscriber role.
	4. Ditto /?s2cleanup=2, /?s2cleanup=3, /?s2cleanup=4
	5. Navigate to /?s2cleanup=removeroles to delete the roles.
	6. Remove the code.
*/
function init_s2cleanup()
{
	if(!empty($_REQUEST['s2cleanup']) && current_user_can('manage_options'))
	{
		echo "<h2>s2member Cleanup</h2>\n";
		global $wpdb;
		
		if($_REQUEST['s2cleanup'] == "removeroles")
		{
			echo "Removing roles s2member_level1-4.";
			
			remove_role("s2member_level1");
			remove_role("s2member_level2");
			remove_role("s2member_level3");
			remove_role("s2member_level4");
		}
		else
		{				
			$level = intval($_REQUEST['s2cleanup']);
			
			//level1
			echo "<h3>s2member Level $level</h3>\n";
			$users = get_users(array("role"=>"s2member_level" . $level));
			foreach($users as $user)
			{			
				echo "User " . $user->user_login . " changed to subscriber.<br />";
				$user->set_role("subscriber");
			}
		}
		
		exit;		
	}
}
add_action('init', 'init_s2cleanup');