The first release of the PHP buildpack after December 14, 2019 will no longer include PHP versions 7.1.x. These PHP versions will no longer be supported upstream. Please migrate your PHP apps to supported versions of PHP before that time.
Note: Unless you are manually specifying a version of PHP for the buildpack to use, or you have customized your PHP buildpack, no action is required.
Elliott Shanks, CF Buildpacks PM