PHP was not working for me as I was encountering this libpng issue, so I reinstalled a new version with Homebrew.
However, I\'m getting a similar error with
I had also this problem. I solved it in this way: Uninstall jpeg/8b:
brew uninstall --ignore-dependencies libjpeg
Uninstall jpeg/9b:
brew uninstall --ignore-dependencies jpeg
Re install jpeg/9b
brew install jpeg