/** * Increments an integer config value directly in the database. * * Using this method instead of setting the new value directly avoids race * conditions and unlike set_atomic it cannot fail. * * @param string $key The configuration option's name * @param int $increment Amount to increment by * @param bool $use_cache Whether this variable should be cached or if it * changes too frequently to be efficiently cached. */ function increment($key, $increment, $use_cache = true) { if (!isset($this->config[$key])) { $this->set($key, '0', $use_cache); } $sql_update = $this->db->cast_expr_to_string($this->db->cast_expr_to_bigint('config_value') . ' + ' . (int) $increment); $this->db->sql_query('UPDATE ' . $this->table . ' SET config_value = ' . $sql_update . "\n\t\t\tWHERE config_name = '" . $this->db->sql_escape($key) . "'"); if ($use_cache) { $this->cache->destroy('config'); } $this->config[$key] += $increment; }