[flexcoders] Convert ArrayCollection to Array

[s_hernandez01]

I'm trying to convert my ArrayCollection in my datagrid to an Array so I can 
use the post method to send out the array to php from flex, but php is not 
recognizing the array can someone tell me what I'm doing wrong:

public var ac:ArrayCollection = new ArrayCollection();

public function uploadData():void{

var postArray:Array = new Array();
postArray = ac.source;

}