We’ve added “always_populate_raw_post_data” to the PHP Selector, it has 3 settings Off (Default), On and “-1”.

This has been deprecated in PHP 5.6, so if you need to use a script (like the Magento 2 installer, not softaculous) to overcome some errors you will need to set this variable to “-1”.

Original Magento Article

Now you can do this from your Control Panel