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This is a basic example of using LoadVars to load variables from a PHP script and based on the success or failure select different content for the user to see.
Files are configured to publish the TestLoadVars movie and its html file in the same folder on your PHP web server and to launch using http://www.yourphpserver.___/path_to_TestLoadVars.html/TestLoadVars.html.
If you want to test inside of the Flash IDE, then you need to change the last lines in frame 1 of TestLoadVars.fla to include http://www.yourphpserver.___/path_to_TestLoadVars.php/TestLoadVars.php. There are comments in TestLoadVars.fla for this.
Key item to remember is that anything outside the PHP tags in TestLoadVars.php is returned and this is received by LoadVars. So no whitespace (tabs, spaces, returns characters of any type) outside of the PHP tags.