PHP extension formulae for the Homebrew package manager. These extensions are not a part of Homebrew/core because they are either not popular enough or have known stability problems.
Other extensions that used to be available from, the now deprecated, Homebrew/php should be installed through PECL.
brew tap smillerdev/php-ext then brew install <formula>
First, please run brew update and brew doctor.
Second, read the Troubleshooting Checklist.
If you don't read these it will take us far longer to help you with your problem.
Code is under the BSD 2-clause "Simplified" License.
Thanks @kabel, I happily copied this.