js or php?

why not learn both ? from personal experience don't go for one language try to learn other as well. JS, PHP or Python they all are scripting language so if you learn one language better you can easily change with others. Second is what is your priority if you are learner learn both , if you are job seeker learn JS because it have more jobs & better salary and last if you have some personal project they try to find real need of the project.