PHP $_FILES中error返回值详解
用PHP上传文件时，我们会用程序去监听浏览器发送过来的文件信息，首先会通 过$_FILES['error']的不同数值来判断此欲上传的文件状态是否正常。$_FILES ['error']==0代表一切正常，其它数值的具体含义请参考下面一段程序的注释部分，如有翻译不到之处还望指正！
switch($_FILES[$field]['error']) {
case 1:
// 文件大小超出了服务器的空间大小
$this->setError("The file is too large (server).");
break;
case 2:
// 要上传的文件大小超出浏览器限制
$this->setError("The file is too large (form).");
break;
case 3:
// 文件仅部分被上传
$this->setError("The file was only partially uploaded.");
break;
case 4:
// 没有找到要上传的文件
$this->setError("No file was uploaded.");
break;
case 5:
// 服务器临时文件夹丢失
$this->setError("The servers temporary folder is missing.");
break;
case 6:
// 文件写入到临时文件夹出错
$this->setError("Failed to write to the temporary folder.");
break;
}
来自: http://hi.baidu.com/jerrycn/blog/item/f1a9ad31c476a0a35edf0eca.html
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