Something similar has been in IDEs. Quanta+ had a good popup PHP reference... Aptana/Eclipse has PHPdocumentor in it, which lets you annotate your functions and such so information pops in when you type in a function.
If I wanted to get more detailed I go to php.net on-line manual, there's not really anything comparable to that site, description, examples and relevant discussion of all the commands/functions.
If I wanted to get more detailed I go to php.net on-line manual, there's not really anything comparable to that site, description, examples and relevant discussion of all the commands/functions.