http://getcomposer.org/doc/00-intro.md#using-composer

$ brew install josegonzalez/php/composer

出現錯誤：

composer: Missing PHP53, PHP54 or PHP55 from homebrew-php. Please install one of them before continuing

composer安裝提示：

Note: If you receive an error saying PHP53 or higher is missing use this command to install php brew install php53-intl

執行$ brew install php54-intl 提示：

Error: No available formula for zlibPlease tap it and then try again: brew tap homebrew/dupesSearching taps…

執行$ brew tap homebrew/dupes

再執行：$ brew install josegonzalez/php/composer

參考：http://www.torounit.com/blog/category/php/