php文件上传,该如何处理

php文件上传
Notice: Undefined index: file in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\updoad-file.php on line 3 Notice: Undefined index: file in C:\Program Files\Apache Softw are Foundation\Apache2.2\htdocs\updoad-file.php on line 9 Upload:
Notice: Undefined index: file in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\updoad-file.php on line 10 Type:
Notice: Undefined index: file in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\updoad-file.php on line 11 Size: 0 Kb
Notice: Undefined index: file in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\updoad-file.php on line 12 Stored in:
怎么一直提示这个，不懂,求教!!!!

if ($_FILES["file"]["error"] > 0)
{
echo "Error: " . $_FILES["file"]["error"] . "
";
}
else
{
echo "Upload: " . $_FILES["file"]["name"] . "
";
echo "Type: " . $_FILES["file"]["type"] . "
";
echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb
";
echo "Stored in: " . $_FILES["file"]["tmp_name"];
}
?>

------解决方案--------------------
表单文件控件的name不是file吧？

------解决方案--------------------
检查一下php.ini，看看是否允许上传文件（file_uploads = On）。
------解决方案--------------------
除了name以外其他几个都没有值，应该是上传未完成php就执行了
传送的文件太大了？
------解决方案--------------------
表单:

php.ini里也要设置下. file_uploads = On。