php下载文件功能怎么实现，新手
php下载文件功能如何实现，新手求助！
php文件下载怎么写啊?第一次做这个，所以不知道怎么做了，在php页面
然后用move_uploaded_file方法将文件放到项目里的upload文件夹下（$path = '/upload/documents/'.time();）
在那个php页面里有 输入几个text框，然后就是 上传文件 一个text 旁边是一个Browse按钮，然后点击页面的保存的话，就会将上传文件保存到上面的项目upload文件夹下。
但我想在点击browse按钮，然后选择文件之后，这个文件象征性的在页面中显示，就像很多邮箱里上传文件之后那样，然后再点击页面中的保存按钮，就上传到那个文件夹下，这个我不会
以上是添加内容的页面，但我在编辑这个页面的时候，那个已经上传的文件怎么显示，并且下载啊？ 因为在编辑页面中也只有 一个text和旁边的browse按钮。
就是下载的功能也不知道怎么做下去了。下载该怎么做？网上查了点，说是什么直接点击链接（这个链接写在哪里，怎么写）文件的路径。
------解决方案--------------------
$_FILES获取上传文件名，下载使用header函数，但是在header之前不能有输出，一般下载是一个单独的页面
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