What programming languages are influenced by PHP? It really is a leaf node. This is not intrinsically a criticism. PHP arguably got a lot of libraries created that copies the way it did HTML templating (and I mean the core PHP here, not subsequent template libraries), but that probably wouldn't show here.

The flip side of this, incidentally, would be Haskell. Still pretty unusual to encounter in the wild, but it has influenced a lot of languages, and will continue to do so, possibly without ever being a top-tier success itself.