Flex: How to send the names/labels of selected items from a list to a php file

I know i can access multiply selected options of a list by

var selectedAlgos:Array = algosList.selectedItems;

where algosList is the name of my List.

How to i send this array via HTTPService to a phpfile and how can i then access the elem开发者_运维技巧ents of this array from the php file?

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Turn those items into a string using algosList.selectedItems.join(",");