Strange Array Error

["Shaun" <shaunthornburgh@xxxxxxxxxxx>]

Hi,

I have been trying for the past two hours to understand why I get an error 
with the following code:

<?php
 $test_array[] = array();
 $i = 0;
 while($i < 7){
  $test_array[$i] += $i;
  echo '$day_total[$i] = '.$day_total[$i].'<br>';
 }
?>

Fatal error: Unsupported operand types in 
/usr/home/expensesystem/public_html/test.php on line 5

I am trying to create a loop where $i is added to array element $i, and 
can't find any information relating to this on google or php.net...

Thanks for your advice. 

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