Going through numbered variables from php in as3

hi
in as2 i could write the following to check for existing variables in a LoadVars() object called [COLOR=#000000][COLOR=#0000bb]loadvarsobject in this example[/COLOR][/COLOR]:

for(i=1;loadvarsobject["textvar"+i];i++){
this.["textfeld"+i].text=loadvarsobject["textvar"+i];
}

with this simple process i could create whole stuctures based on the existing variables from a php file.
how do i do this in as3 using the URLLoader class?
im not asking how to get data from php to flash using URLLoade, my question is just about how go through and access numbered variables from php.