Jason McCreary has posted an update to his guide for installing PHP on Mac OS X and replacing the version of PHP that comes with El Capitan (5.5) with a handy package manager more specific to PHP installations.
As noted in my posts on Installing Apache, PHP and MySQL on Mac OS X, OS X comes pre-installed with Apache and PHP. Unfortunately, as of Mac OS X 10.11 (El Capitan) the pre-installed version of PHP is still 5.5. As PHP 5.5 has reached end of life, I imagine the pre-installed version of PHP will be updated with Mac OS 10.12 (Sierra). However, it may only be PHP 5.6.
With this package manager, the installation is only a few steps but he lists them out with a bit more detail to help you understand what's happening:
- Installing PHP (your choice of version)
- Configuring Apache (loading the php5 shared module)
- Updating your PATH
- Configuring PHP