网站图片上传可以实现秒传功能吗？
比如360云盘等网盘，有时在上传文件时会有“秒传”效果，搜索了一下，这个原理是 每个文件都有自己独立的哈希值和MD5值，这样就可以在上传时判断该文件在服务器是否已经存在了，所以才能实现秒传的功能。
那么我们php网站也可以实现这样的功能吗，我知道在客服端不能识别图片的MD5但是，只要传到空间后能识别这样就增加了空间的利用率啊，以不至于很多相同的图片被重复上传而保存在服务器上面。
可不可以实现呢？
除了图片，其它文件也有唯一的标示吧，也可以实现这样的吧。
有没有这样做的必要呢？
回复内容：
比如360云盘等网盘，有时在上传文件时会有“秒传”效果，搜索了一下，这个原理是 每个文件都有自己独立的哈希值和MD5值，这样就可以在上传时判断该文件在服务器是否已经存在了，所以才能实现秒传的功能。
那么我们php网站也可以实现这样的功能吗，我知道在客服端不能识别图片的MD5但是，只要传到空间后能识别这样就增加了空间的利用率啊，以不至于很多相同的图片被重复上传而保存在服务器上面。
可不可以实现呢？
除了图片，其它文件也有唯一的标示吧，也可以实现这样的吧。
有没有这样做的必要呢？
当然可以实现的。参见我在这个问题的回答。
而本地文件MD5的判断，就得借助浏览器和 JavaScript 了，现代浏览器都支持 FileReader ，可以读取本地文件，然后使用 JavaScript 来计算文件的 MD5 值，再把 MD5 值传到服务器端判断文件是不是已经在此前上传过了。
有个更好的方案，文件名字统一以文件本身的md5加盐生成，只用比较文件名就可以了！规则可以自己定
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