Many PHP functions, such as htmlentities(), take constants for certain parameters. Remembering all these constants is virtually impossible for my memory-challenged brain, which means I get to look in the docs virtually every time. It would be great if PhpED could at least list the constants in its function help pop-up, and even better, if it could actually do code-completion for them.

I second Bob's suggestion. Code completion for PHP's built-in constants and also for superglobals like $_SERVER would be most welcome.

I third the suggestion! It's funny, I used the EXACT same example when I requested that hitting the f1 key while within the parens of a function open the php manual to the function (turns out phped does do this, but you have to be on the function name, now within the parens). specifically because i can never remember all the defined constant arguments for the different functions. So, I like this request even better!