PHP：在 move_uploaded_file() 之后添加对文件的写权限
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PHP : add write permission to file after move_uploaded_file()
提问by Raptor
After an image is uploaded with PHP, I want to make the image file writable in order to add a watermark to it . Here are the codes I used:
使用 PHP 上传图像后，我想让图像文件可写，以便为其添加水印。以下是我使用的代码：
if(isset($_FILES['file_poster']['tmp_name']) && $_FILES['file_poster']['tmp_name'] != '') {
$random_filename = substr(md5(time()), 0, 9);
$ext = '.jpg';
if(strpos(strtolower($_FILES['file_poster']['name']), '.png') > -1) {
$ext = '.png';
}
move_uploaded_file($_FILES['file_poster']['tmp_name'], 'uploads/' . $random_filename . $ext);
chmod(ABS_PATH . $random_filename, 0666);
$random_filename = 'uploads/' . $random_filename . $ext;
// add watermark codes omitted
}
After the file is uploaded, the file permission becomes 644. Then I tried to use chmod()to change it to writable ( 666), but the permission doesn't change.
文件上传后，文件权限变为644。然后我尝试使用chmod()将其更改为可写（666），但权限没有改变。
The /uploadsfolder has permission 777. Is there any reason that makes chmod()function fails to change permission? or is there a workaround?
该/uploads文件夹具有权限777。是否有任何原因使chmod()功能无法更改权限？或者有解决方法吗？
Note: PHP 5 is used. GD is working properly.
注意：使用 PHP 5。GD 工作正常。
回答by Phil
Looks like you need to swap your last two lines, eg
看起来您需要交换最后两行，例如
$random_filename = 'uploads/' . $random_filename . $ext;
chmod(ABS_PATH . $random_filename, 0666);
Be very careful when using relative paths such as 'uploads/' . $random_filename . $ext. If the working file is included into another file, the current directory may differ.
使用相对路径时要非常小心，例如'uploads/' . $random_filename . $ext. 如果工作文件包含在另一个文件中，当前目录可能不同。
I would recommend something like this
我会推荐这样的东西
$destFile = __DIR__ . '/uploads/' . $random_filename . $ext;
move_uploaded_file($_FILES['file_poster']['tmp_name'], $destFile);
chmod($destFile, 0666);
where the magic __DIR__constant always contains the absolute path to the parent directory of the file you're actually in.
其中魔术__DIR__常量始终包含您实际所在文件的父目录的绝对路径。
