How can I install PHPmyadmin on Mac Lion using Homebrew

You may need to set up some dependencies first. Here's what I had to do:

brew tap homebrew/dupes
brew tap homebrew/homebrew-php
brew install phpmyadmin

This information was from the homepage for Homebrew-PHP, "a centralized repository for PHP-related brews".

This is the command if you have homebrew installed:

brew install phpmyadmin

as of this writing, brew install homebrew/php/phpmyadmin works