Server-side only. Bind a custom property to a socket, which can be used later on
_Io_socketSetProperty(Const $socket, $sProp, $value)
| True if successfull, @error if error. |
the props `socket`, `ip` and `date` is reserved. @Error 1 = reserved prop name used. @Error 2 = invalid property name. Only a-zA-Z 0-9 and _ is allowed.
_Io_socketGetProperty, _Io_getFirstByProperty, _Io_getAllByProperty