have you tried to setup result event and fault event handlers for your web service and then in result handler access results using ResultEvent result property:
(your original question seems to assume that somehow your web service has already received data so you're trying to use lastResult property).
If you are using Flash Builder you could even monitor http traffic with your web service, see introductory article here:
Thanks for your reply. After your comments, I went through some more flex tutorial and realise using Http call to XML files would be a better approach (For me easier to implement)
Thanks a lot!
Alex Lee (www.aboutknowledge.com)
Now I have got it sorted, I have taken your comments and tried the result handler and fault handler and have written an article in here http://blog.aboutknowledge.com/2011/05/26/actionscript-flex-4-5-connect-mysql-with-php-usi ng-result-handler/ :-)
Thanks so much for your help!