Plugin not working

[fwarren]

I am using vim-plug. I followed the instructions for installing, and :PlugInstall shows that php-foldexpr is installed. However when I open a php file in vim. There is no code folding with zR zr za za, etc.

:verbose let b:phpfold_use yields "variable undefined" and php-foldexpr shows up in :scriptnames The script acts as if it is not loaded automatically when I open a php file.