Function: Determines whether the current installation is running PHP 5.3 or greater.

Function: Replaces WP’s default update notice on plugins.php with an error message, when site is not running PHP 5.3 or greater.

Function: On the “Dashboard > Updates” page, remove BuddyPress from plugins list if PHP < 5.3.

Function: Filter callback to remove BuddyPress from the update plugins list.

Function: Outputs a replacement for WP’s default update notice, when site is not running PHP 5.3 or greater.

Function: Add an admin notice to installations that are not running PHP 5.3+.