Homebrew and the homebrew-php tap make it easy enough to install multiple versions of PHP, but they don't make it all that convenient to switch between them. Specifically, the instructions recommend altering your shell's path and your apache config every time you switch versions. This script automates that process and reboots apache for you (if it's running).
Install from npm.
npm install -g brew-php-select
Then, add the following to your httpd.conf. (The following step will create
LoadModule php5_module /usr/local/php/libexec/apache2/libphp5.so
Finally, execute the following to ensure all the required symlinks exist (Use whichever php version you actually need.)
brew-php-select --set php52
Display the available PHP brews:
Set the active brew to PHP 5.3
brew-php-select --set php53