After looking at PHPstorm's pricing, I thought I'd take a look at the open source editors. Could I at least get function name completion, if no other thing?
Geany gave me instant completion for php function names (a drop-down appears after 4 chars of a function name are typed). Geany is a stock Debian package, just saying. I also installed the package "geany-plugin-codenav" for good measure.
I'm just a noob coder, so this plenty for now. I'm just doing "Hello World"-style PHP coding samples at this time. Once my sophistication increases, I'll revisit PHPstorm.
😊