全局帮助方法

• dump( mixed $arg, [, mixed $...] )

• dumpdie( mixed $arg, [, mixed $...] )

• run_info($verbose = false)

• wlog($name, $value)

• show_404()

• show_success($message, $url = '', $wait = 6)

• show_error($message, $url = '', $wait = 6)

• R($url, $wait = 0, $message = '')

• getv($key, $default = '', $callback = '')

• getp($pos, $default = '', $callback = '')

• postv($key, $default = '', $callback = '')

• requestv($key, $default = '', $callback = '')