我有以下代码示例upload3.PHP：
<html>
<head>
<title>PHP Form Upload</title>
</head>
<body>
<form method='post' action='upload3.PHP' enctype='multipart/form-data'>
Select a File:
<input type='file' name='filename' size='10' />
<input type='submit' value='Upload' />
</form>
<?PHP
if (isset($_POST['submit']))
{
echo "isset submit";
}
else
{
echo "NOT isset submit";
}
?>
</body>
</html>
代码始终返回“NOT isset submit”.
为什么会这样？因为相同的脚本upload3.PHP调用自己？
您没有名为的提交按钮：
更改
更改
<input type='submit' value='Upload' />
至：
<input type='submit' value='Upload' name="submit"/>