使用 PHP 重命名上传的文件但保留扩展名

问题描述

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

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