linux服务器上的图片上传（PHP）

Question

I am trying to upload image to server. The following code works when I use on local pc but when I try on server, image is not uploaded.

$img = $_FILES['file_uploaded']['name'];
$image_temp = $_FILES['file_uploaded']['tmp_name'];
if(move_uploaded_file($image_temp, "uploads/" . $img)){
    $fullpath =  dirname(__FILE__) . '\\images\\' . $img;
}
else
    echo 'Failed!';

Answer 1

Do you have the same file permissions on server? Does folder /var/www/html/uploaded exist and is writable by web server user (usually www-data)?

Try running following command in server terminal:

sudo su
mkdir /var/www/html/uploads
chmod -R 775 /var/www/html/uploads
chown -R www-data:www-data /var/www/html/uploads

Where www-data is used, change it with your own web server user.

"FIXED" SCRIPT:

$img = $_FILES['file_uploaded']['name'];
$upload_dir = "/var/www/html/uploads/";
$image_temp = $_FILES['file_uploaded']['tmp_name'];
if (file_exists($image_temp)) {
     echo "Temp file doesn't exist.";
     return false;
}
$move_file = move_uploaded_file($image_temp, $upload_dir . $img);
if ($move_file) {
    $fullpath =  $upload_dir . $img;
}
else {
    echo 'Failed!';
    return false;
}

You should write additional checks, so you know where your application fails.

Regarding security, you should never trust user. In this case we used filename ($_FILES['file_uploaded']['name'])provided by user, using which he could write and maybe even read outside of designated directory