You may have scripts that do not need variables from the flash movie. In that case, you can leave the LoadVariablesNum() option set to 'Don't Send Variables'. Otherwise, you will need to set this option to 'POST' if you want variables to be sent into the script. Keep in mind that only the variables from the movieclip that contains the LoadVariablesNum() command will be sent!
Variables In PHP
Variables in a PHP script have a '$' in front of them. For example, the variable named 'who' in flash will be '$who' in the PHP script.