Thanks a lot bswajitgiri 🙂
I had first called my small business yahoo CC and they had resotred my website to my previous version .
But still I was unable to login to my WordPress dashboard. It was giving the same php version error.
I deleted the plugin that I had installed today ( database sample table something) .
That was problematic for me.
So the issue has been resolved now.
Thanks a lot dude.
Much appreciated !!