add.php(When user click add photo)
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To use session variables, please add session_start() at the begin of your files, otherwise they aren't used. Secondly you are adding an array into a next array.
so you have to use
$_SESSION["auctionImages"] = $auctionImage;
or
$key=array_search($a[0],$_SESSION['auctionImages']);
Further debugging can be done by print_r($_SESSION); so you can track the contents of this array