PHP Uploading Files Mysql Fail

Question

Can anybody please point out mistakes I make in this code?

for($i=0; $i<count($fileDirectories); $i++){

            echo 'asdasd';
            echo $fileDirectories[$i];
            $queryFiles = "UPDATE maintable SET Picture$i = '$fileDirectories[$i]' WHERE id = $idNeeded;";
            mysqli_query($link, $queryFiles); 
        }

I just cant find a good duide to that

Answer 1

$queryFiles = "UPDATE maintable SET Picture$i = '$fileDirectories[$i]' WHERE id = '$idNeeded'";