php文件上传问题?
html页面代码:

HTML code

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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>文件上传</title>


<h1>文件上传</h1><br>

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PHP code

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<?php if($_FILES['userfile']['error']>0)
    echo "上传失败!!";
else 
    echo "上传成功!!";
if($_FILES['userfile']['type'] !='text/plain')
    echo "请选择正确的文件类型!!";
?>

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