[Phpug] Interview questions

[Kae Verens]

Cormac Parle wrote:
> We're looking for a php/ajax expert for a contract here, doing 
> interviews on Friday. I know php well, but my ajax experience is limited 
> - any suggestions for questions I could ask to find out if the 
> candidates know more than me (which is what we need)?

Ajax-related:

what's the difference between Comet and normal Ajax requests?
  Comet opens up a "continuous feed" connection to the client, allowing 
very fast responses to requests, whereas each normal Ajax request starts 
a new HTTP connection

what major problems is there with ActiveX and Ajax in older IE versions 
(IE6) and is there a workaround?
   if ActiveX is disabled, e.g. for security reasons, then Ajax will not 
work in IE6. one workaround is to use IFrames as a replacement in that case

what is a closure, and why is it useful for Ajax?
   a Closure is an artificial environment generated in Javascript which 
allows variables to remain in memory for use in asynchronous calls, even 
after the function that generated the variables has finished and scoped 
variables have been destroyed.
   This is useful for Ajax because Ajax is usually asynchronous, and by 
the time the response has returned, normal-scoped variables will no 
longer exist so the call's context will have been forgotten.

can't think of any other fancy Ajax-related questions at the moment.

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