Question

我收到通知说有undefined variable: ShowErrorPage in C:\xampp\htdocs\dwupload\FileDownloader.php on line 18和undefined variable: ErrorMsg in C:\xampp\htdocs\dwupload\FileDownloader.php on line 39

在这里，我展示了我的上传，下载和查看文件：

FileUploader.php

上传文件

<body>

<?php

$Dir = "files";
if (isset($_FILES['new_file'])) {
    if (move_uploaded_file($_FILES['new_file']['tmp_name'], $Dir . "/" . $_FILES['new_file']['name']) == TRUE) {
        chmod($Dir . "/" . $_FILES['new_file']['name'], 0644);
        echo "File \"" . htmlentities($_FILES['new_file']['name']) . "\"successfully uploaded. <br />\n";
    }
    else 
        echo "There was an error uploading \"" . htmlentities($_FILES['new_file']['name']) . "\" .<br />\n";
}

?>

<form action="FileUploader.php" method="POST" enctype="multipart/form-data">
    <input type="hidden" name="MAX_FILE_SIZE" value="25000"/><br />
    File to upload: <br />
    <input type="file" name="new_file" /><br /> (25,000 byte limit) <br />
    <input type="submit" name="upload" value="Upload The File" />
    <br />
</form>
</body>

</html>

ViewFile.php

＆＃13;

<!DOCTYPE html>
    <html>
    <head>
    <title>ViewFile</title>
    </head>
    
    <body>
    
    <?php 
    
    $Dir = "files";
    $DirEntries = scandir($Dir);
    foreach ($DirEntries as $Entry) {
    	if ((strcmp($Entry, '.') != 0) && (strcmp($Entry, '..') != 0))
    	echo "<a href=\"FileDownloader.php?filename=$Entry\">". htmlentities($Entry). "</a><br />\n";
    	
    }
    
    ?>
    
    </body>
    
    </html>

＆＃13;

FileDownloader.php

＆＃13;

<?php

$Dir = "files";
if (isset($_GET['filename'])) {
	$FileToGet = $Dir . "/" . stripcslashes($_GET['filename']);
	if (is_readable($FileToGet)) {
	}
	else {
		$ErrorMsg = "Cannot read \"$FileToGet\"";
		$ShowErrorPage = TRUE;
	}
}
else {
	$ErrorMsg = "No filename specifified";
	$ShowErrorPage = TRUE;
}

if ($ShowErrorPage) {
	header("Content-Description: File Transfer");
	header("Content-Type: application/force-download");
	header("Content-Disposition: attachment; filename=\"" . $_GET['filename'] . "\"");
	header("Content-Transfer-Encoding: base64");
	header("Content-Length: " . filesize($FileToGet));
	readfile($FileToGet);
	$ShowErrorPage = FALSE;
}

?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>DownloadFile</title>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
</head>

<body>
<p>There was an error downloading "<?php echo htmlentities($_GET['filename']); ?></p>
<p><?php echo htmlentities($ErrorMsg); ?></p>




</body>

</html>

＆＃13;

有谁知道为什么它会给我通知？并且FileDownloader.php中没有错误，但是当我尝试下载使用FileUploader.php上传的文件时，它表示上传时出现了错误。有人可以帮帮我吗？我在php中还是新手，我需要有人来指导我。谢谢。

Answer 1

在条件语句中直接赋值之前，需要使用默认值声明这些变量。在文件的开头添加这个

$ShowErrorPage = TRUE;
$ErrorMsg = '';

FileDownloader.php中的undefine变量

1 个答案: