Description:
------------
It seems to be an bas assignation for the array.
The engine begins to increment the variable, before
assign in the array's key.

Reproduce code:
---------------
<?
$table = array();
$i = 0;
$table [$i][0] = $i++;
print_r($table);
?>



Expected result:
----------------
Array
(
    [0] => Array
        (
            [0] => 0
        )

)

Actual result:
--------------
Array
(
    [1] => Array
        (
            [0] => 0
        )

)