php 上传时唯一的文件名 [英] php Unique filename when uploading

问题描述

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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