I downloaded your package and it installed no problem and I've got gPHPedit up and running right now. Wish I new how to use it.
I took a look at the slack-required list and all the required bits where already present in my machine. Which is good since just running installpkg, won't get those dependencies for me.
I couldn't find a copy of the slackbuild in docs when I opened the .tlz with Xarchiver, so I'm not sure if you got all the details that would be necessary for it to be an official package. However, it works just fine.
If you would be interested in doing some packaging for VL that would be great. Nothing promotes a distro like a robust repository.
If you still want to know more about packaging here are some resources....
Some of the rulesNew packaging rules
Some of the tut's I've been making as I myself learn how to package.VL packaging video tutorials