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<form action="">
<input id="items_EMPTY_INDEX_id" name="look[item_attributes][EMPTY_INDEX][id]" value="" type="hidden" />
<input id="items_EMPTY_INDEX_x" name="look[item_attributes][EMPTY_INDEX][x]" type="text" value="EMPTY_X" />
<input id="items_EMPTY_INDEX_y" name="look[item_attributes][EMPTY_INDEX][y]" type="text" value="EMPTY_Y" />
<input type="submit" name="submit">
</form>
<?php
$look=$_REQUEST['look'];
echo $look[item_attributes][EMPTY_INDEX][id];
echo $look[item_attributes][EMPTY_INDEX][x];
echo $look[item_attributes][EMPTY_INDEX][y];
?>