引用Log into your ftp and confirm the following:
* The folder exists, check for spellings
* Check the properties of the folder and make sure the permissions have read+write 0666
* Make sure the file is within your public html root, otherwise double check the owner of the file, and make sure PHP Has read / write access to it.
引用Looks like it doesn't know where upload/ is. Make sure you have the full path in your statement. For example, if upload directory is actually located in /var/upload, then make sure that is in your statement, not just upload/.
解决方案：
- 修改文件目录的权限
- 把相对路径修改为绝对路径（或者之前的相对路径不正确）
参考这里：
http://stackoverflow.com/questions/5023181/php-move-uploaded-file-unable-to-move
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