Why i received error message:Warning: implode() [function.implode]: Invalid arguments passed in C:\wamp\www\test.php on line 489

PHP
Why i received error message:Warning: implode() [function.implode]: Invalid arguments passed in C:\wamp\www\test.php on line 489

i have this code

if my select output is empty would  it display this message?

function getStock()
{
$query =mysql_query("SELECT MAX(TEST1.DAILYSTOCK.STOCKREFILLDATE) AS STOCKREFILLDATE, TEST1.DAILYSTOCK.BARCODE
         FROM TEST1.DAILYSTOCK JOIN TEST2.ITEM ON TEST1.DAILYSTOCK.ITEMID = TEST2.ITEM.ITEMID
         WHERE TEST2.ITEM.SUPPLIERID = "15466654"
         GROUP BY TEST1.DAILYSTOCK.BARCODE");
 
  while($row = mysql_fetch_array($result))
	 {
      $this->GetstockReturn[$i]  = array($row['STOCKREFILLDATE'],$row['TEST1.DAILYSTOCK.BARCODE']); 
	  $i++;
	 }
 }
 
function readgetstock()
{
foreach( $this->GetstockReturn as $stock)
{
$this->arrayreadgetstock_value[] .= implode("|", $stock);
}
}

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