Hi Seyed,
Did you try PHP 7.0.2?
I am not sure about what happened regarding memcache, but for Xcache, what error message are you seeing during compilation?
EDIT:
I just found out that there is no official/stable release for memcache and Xcache with regards to PHP 7 yet. Therefore, we will not support this combination until one is released.
We apologize for any inconvenience that this may cause.
Kevin