php 上传时唯一的文件名
我在我的网站上有一个带有图片上传的提交讨论表单.现在，我想在用户提交他们的图像时上传一个唯一的文件名，这样我就可以显示所有图像的结果，并且可以避免重复的文件名.
I've a submit discussion form with image upload in my website. Now, I want to upload a unique file name when the user submits their image so that I can show the result of all images and can avoid duplicate file names.
我怎样才能用 php 做到这一点?如果您需要我的表单处理代码，我会上传.
How can I do this with php? If you need my form process code then I'll upload it.
推荐答案
可以使用uniqid()函数生成唯一ID
You can use the uniqid() function to generate a unique ID
/**
* Generate a unique ID
* @link http://www.php.net/manual/en/function.uniqid.php
* @param prefix string[optional] <p>
* Can be useful, for instance, if you generate identifiers
* simultaneously on several hosts that might happen to generate the
* identifier at the same microsecond.
* </p>
* <p>
* With an empty prefix, the returned string will
* be 13 characters long. If more_entropy is
* true, it will be 23 characters.
* </p>
* @param more_entropy bool[optional] <p>
* If set to true, uniqid will add additional
* entropy (using the combined linear congruential generator) at the end
* of the return value, which should make the results more unique.
* </p>
* @return string the unique identifier, as a string.
*/
function uniqid ($prefix = null, $more_entropy = null) {}
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