Seems very limited compared to the PHP.net documentation. For instance I like to see return values.
Also, PHP being PHP certain sections are a bit of a mess, such as str* function, and having the 'see also' section along with the function list on the left often helps me find what I'm looking for when I can't remember what it's called.
Thanks for the feedback. This is not meant to be a full replacement for documentation. I always find myself just looking for an example of how to use some code or how to do something with code. This is designed to help solve that problem as quickly as possible. I do think, though, that there is room to add that feature you describe. It would be easy to detect when some characters are entered that are present in a lot of functions, then display a list of relevant functions etc.
Also, PHP being PHP certain sections are a bit of a mess, such as str* function, and having the 'see also' section along with the function list on the left often helps me find what I'm looking for when I can't remember what it's called.