Image upload not moving file php mysql

Image upload not moving file php mysql

Im trying to build an image upload on my site, the code im using inserts
my value into my database, the only problem is my image isnt moved to my
directory?
Can anybody help me on this, or give me advice on how to debug this?
Inputs
<label for="picture_1">picture 1 : </label>
<input type="file" name="picture_1" id="picture_1" />
</li>
<li>
<label for="picture_2">picture 2 : </label>
<input type="file" name="picture_2" id="picture_2" />
</li>
<li>
<label for="picture_3">picture 3 : </label>
<input type="file" name="picture_3" id="picture_3" />
File upload
if(sizeof($_FILES)){
for($i = 1; $i <= 3; $i++) {
$aFile = $_FILES['picture_'.$i];
if(empty($aFile['tmp_name'])) continue; # skip for empty elements
$allowedExts = array("jpg", "jpeg", "gif", "png");
$extension = end(explode(".", $aFile["name"]));
if ((($aFile["type"] == "image/gif")
|| ($aFile["type"] == "image/jpeg")
|| ($aFile["type"] == "image/png")
|| ($aFile["type"] == "image/pjpeg"))
&& ($aFile["size"] < 200000000)
&& in_array(strtolower($extension), $allowedExts))
{
if ($aFile["error"] > 0)
{
echo "Return Code: " .$aFile["error"] . "<br>";
}
else
{
if (file_exists("upload/" . $aFile["name"]))
{
echo $aFile["name"] . " already exists. ";
}
else
{
move_uploaded_file($aFile['tmp_name'],
"upload/" .$aFile["name"]);
echo "Image Uploaded Successfully";
}
}
}
else
{
echo "Invalid file";
}
}