Kevin Pfeiferattention homebrew PHP users: As of recently you have to install php-intl separately as its not part of the default php Formula any more.
https://github.com/Homebrew/homebrew-core/pull/244321
https://github.com/Homebrew/homebrew-core/pull/244321
php: remove linkage to libstdc++, split out php-intl by cho-m · Pull Request #244321 · Homebrew/homebrew-core
Fixes #243881 Avoid segfaults from mixing libstdc++ and libc++ by building the intl as a shared module in a separate formula. This cannot be built at same time as PHP build script adds -lstdc++ to ...