如何我的上传界面显示文件后缀
<!DOCTYPE html PUBLIC '-//W3C//DTD HTML 4.01 Strict//EN' 'http://www.w3.org/TR/html4/strict.dtd'>
<html>
<head>
<meta http-equiv='Content-Type' content='text/html; charset=UTF-8'>
<title>文件上传</title>
</head>
<body>
<form action="doaction.php" method="post" enctype="multipart/form-data">
请选择您要上传的文件:
<input type="file" name="myfile"/><br>
<input type="submit" value="上传文件"/>
</form>
</body>
</html>