After upgrading to Node v.10.9.0 via Homebrew the following error message was thrown from PHP:
dyld: Library not loaded: /usr/local/opt/icu4c/lib/libicui18n.61.dylib
Referenced from: /usr/local/bin/php
Reason: image not found
Reinstall PHP to fix, for me that's:
brew reinstall [email protected]
The reinstall works for me to get php 5.6, 7.0, 7.1, 7.2 running - but not 7.3 and <=7.1 together :(