我真的不知道我在这里做错了什么。我有一个图片上传页面。它在localhost上工作得很好，但是一旦我将它上传到远程服务器，它就不能按我的意愿工作了。我已经更改了文件夹权限，我已经更改了直接仍然无法正常工作。它没有给我任何错误。它显示文件上传成功，但无论何时我检查文件夹，它都是空的。请帮帮我。这是我的代码。
if(isset($_POST['upload']))
{
$tmp_name = $_FILES['passport']['tmp_name'];
if (empty($tmp_name) == false){
$name = $_FILES['passport']['name'];
$type = $_FILES['passport']['type'];
$size = $_FILES['passport']['size'];
list($width, $height, $typeb, $attr) = getimagesize($tmp_name);
if($width<=160 || $height<=160)
{
if($type=='image/jpeg' || $type=='image/jpg' || $type=='image/png')
{
if($size<='20000')
{
if(!get_magic_quotes_gpc())
{
$name = addslashes($name);
$extract = fopen($tmp_name, 'r');
$content = fread($extract, $size);
$content = addslashes($content);
fclose($extract);
//Place image in the folder
$newname="$studentID.jpg";
move_uploaded_file($_FILES['passport']['tmp_name'],"../passports/$newname");
$msg = "<center><p style ='color: #4F8A10; background-color: #DFF2BF; border-radius:.5em; width: 350px; border: 1px solid #D8D8D8; padding: 5px; border-radius: 5px; font-family: Arial; font-size: 11px; text-transform: uppercase; text-align: center; text-transform: uppercase; padding-left: 12px'>Passport uploaded successfully.. Click the link below to continue</p></center>";
} else {
$uploaderror = "<p style='color: #D8000C; background-color: #FFBABA; border-radius:.5em; width: 300px; border: 1px solid #D8D8D8; padding: 5px; border-radius: 5px; margin-left: auto; margin-right: auto; font-family: Arial; font-size: 11px; text-transform: uppercase; text-align: center; text-transform: uppercase'>Error has occured... Please try again</p>";
}
} else {
$uploaderror = "<p style='color: #D8000C; background-color: #FFBABA; border-radius:.5em; width: 300px; border: 1px solid #D8D8D8; padding: 5px; border-radius: 5px; margin-left: auto; margin-right: auto; font-family: Arial; font-size: 11px; text-transform: uppercase; text-align: center; text-transform: uppercase'>$name is more than 20kb</p>";
}
} else {
$uploaderror = "<p style='color: #D8000C; background-color: #FFBABA; border-radius:.5em; width: 300px; border: 1px solid #D8D8D8; padding: 5px; border-radius: 5px; margin-left: auto; margin-right: auto; font-family: Arial; font-size: 11px; text-transform: uppercase; text-align: center; text-transform: uppercase'>$type is not in acceptable format</p>";
}
} else {
$uploaderror = "<p style='color: #D8000C; background-color: #FFBABA; border-radius:.5em; width: 300px; border: 1px solid #D8D8D8; padding: 5px; border-radius: 5px; margin-left: auto; margin-right: auto; font-family: Arial; font-size: 11px; text-transform: uppercase; text-align: center; text-transform: uppercase'>$name should be 160px * 160px</p>";
}
} else {
$uploaderror = "<p style='color: #D8000C; background-color: #FFBABA; border-radius:.5em; width: 300px; border: 1px solid #D8D8D8; padding: 5px; border-radius: 5px; margin-left: auto; margin-right: auto; font-family: Arial; font-size: 11px; text-transform: uppercase; text-align: center; text-transform: uppercase'>Please choose a file to upload</p>";
}
}