In my case, Homebrew was already updated after running brew update , and I still got the same error messages as the OP when trying to install xdebug:
$ brew update Already up-to-date. $ brew install php70-xdebug Error: No available formula with the name "php70-xdebug"
Using the Mark clause from the comments on the OP solved the problem:
$ brew search xdebug homebrew/php/xdebug-osx homebrew/php/php70-xdebug
So, by running $ brew install homebrew/php/php70-xdebug , Homebrew found and installed the package.
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