Errm, you can’t. And more importantly, why would you want to? The whole point of hooks is to open up an API to other developers!
You can use a singleton/static flags and/or private methods (called from a hooked public method) if you want to lock down how your plugin can be manipulated.
static function myfunction_for_themes() {
if ( ! self::$_themes_run /* private static property */ ) {
self::_private_method();
self::$_themes_run = true;
}
}
A plugin/theme could still unhook the above method, but they wouldn’t be able to fire it more than once, nor can they call self::_private_method().
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