WP_CLI::wp_hook_build_unique_id PHP Method

    private static function wp_hook_build_unique_id($tag, $function, $priority)
    {
        global $wp_filter;
        static $filter_id_count = 0;
        if (is_string($function)) {
            return $function;
        }
        if (is_object($function)) {
            // Closures are currently implemented as objects
            $function = array($function, '');
        } else {
            $function = (array) $function;
        }
        if (is_object($function[0])) {
            // Object Class Calling
            if (function_exists('spl_object_hash')) {
                return spl_object_hash($function[0]) . $function[1];
            } else {
                $obj_idx = get_class($function[0]) . $function[1];
                if (!isset($function[0]->wp_filter_id)) {
                    if (false === $priority) {
                        return false;
                    }
                    $obj_idx .= isset($wp_filter[$tag][$priority]) ? count((array) $wp_filter[$tag][$priority]) : $filter_id_count;
                    $function[0]->wp_filter_id = $filter_id_count;
                    ++$filter_id_count;
                } else {
                    $obj_idx .= $function[0]->wp_filter_id;
                }
                return $obj_idx;
            }
        } elseif (is_string($function[0])) {
            // Static Calling
            return $function[0] . '::' . $function[1];
        }
    }