PHP is an HTML-embedded scripting language. Much of its syntax is borrowed from C, Java and Perl with a couple of unique PHP-specific features thrown in. The goal of the language is to allow web developers to write dynamically generated pages quickly.
/DontAddToPath- Do not add install directory to path
/InstallDir- Override the installation directory (needs to be specified both during install and update, until it is remembered by choco)
/ThreadSafe- Install the thread safe version of php that is compatible with Apache.
These parameters can be passed to the installer with the use of --params.
--params '"/ThreadSafe ""/InstallDir:C:\PHP"""'.