(PHP 4, PHP 5)
wddx_add_vars — Add variables to a WDDX packet with the specified ID
Serializes the passed variables and add the result to the given packet.
This function takes a variable number of parameters.
A WDDX packet, returned by wddx_packet_start().
Can be either a string naming a variable or an array containing strings naming the variables or another array, etc.
成功时返回 TRUE, 或者在失败时返回 FALSE.