with the advent of web-syndication, a few different feed protocols have evolved (rss and atom being the most popular). because of their growth in popularity the protocol to create a feed has become more stringent. luckily we have validators who help us keep our feeds on the right track. one of these guidelines is RFC822 compliant dates. these dates look like Sat, 14 Jul 2007 18:40:26 -0400. formatting your data to be compliant with this standard can be challenging, so i have written some code to help you along... 

Creating a RFC822 compliant date in php is a snap...

$rssDate = date("r");

in asp.net this is a bit more tricky. microsoft doesn't have a native RFC822 date format, so we are going to have to convert our dateTime.now() into that format...

Read: RFC822 compliant dates for rss feeds »

the key to creating dynamic systems on the web is the ability to send and receive data from one component to the next. flash and flex are no different. there are a lot of cases where you need to send these variables while the application is running, but there are an equal amount of times where the application needs data at run time. passing variables to flash historically has been rather easy, you just query-string data right into the src tag of your flash movie:

src="test.swf?passed=hello"

by doing this flash would create a new variable (in this case named passed) when the flash movie is loaded. but with the advent of OOP coding in AS3, this technique has become depreciated. 

in actionscript 3 you need to use the flashvars parameter to send data to your flash movie. the technique is the same for both flash and flex, but once the variable is passed flash and flex has a different syntax to access these vars.

Read: actionscript 3 runtime variables »

<?php
$email = 'someone@somewhere.com';
if (!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $email)) {
    //invalid email
} else {
    //valid email
}
?>