使用 PHP 重命名上传的文件但保留扩展名
我正在使用 PHP 将图像从表单上传到服务器，并想重命名图像 lastname_firstname.[原始扩展名].我目前有:
I'm using PHP to upload an image from a form to the server and want to rename the image lastname_firstname.[original extension]. I currently have:
move_uploaded_file($_FILES["picture"]["tmp_name"], "peopleimages/" . "$_POST[lastname]" . '_' . "$_POST[firstname]")
当然，它会重命名文件 lastname_firstname 而不带扩展名.如何重命名文件但保留扩展名?
which, of course, renames the file lastname_firstname without an extension. How do I rename the file but keep the extension?
谢谢！
推荐答案
你需要先找出原来的扩展名是什么;-)
You need to first find out what the original extension was ;-)
要做到这一点，pathinfo函数可以创造奇迹;-)
To do that, the pathinfo function can do wonders ;-)
引用手册中给出的示例:
Quoting the example that's given in the manual :
$path_parts = pathinfo('/www/htdocs/index.html');
echo $path_parts['dirname'], "
";
echo $path_parts['basename'], "
";
echo $path_parts['extension'], "
";
echo $path_parts['filename'], "
"; // since PHP 5.2.0
会给你:
/www/htdocs
index.html
html
index
作为旁注，不要忘记安全性:
As a sidenote, don't forget about security :
- 在你的情况下，你应该转义
$_POST[lastname]，以确保它只包含 valid 字符- 顺便说一句，你应该使用
$_POST['lastname']-- 见 为什么$foo[bar]错了?
- In your case, you should escape
$_POST[lastname], to make sure it only contains valid characters- And, BTW, you should use
$_POST['lastname']-- see Why is$foo[bar]wrong?
- 参见
mime_content_type用于 PHP <5.3 - 和/或
finfo_file对于 PHP >= 5.3
- And, BTW, you should use
- 顺便说一句，你应该使用
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