关于PHP的FTP学习（代码示例）-爱站

现在终于到了我们的第三个文件，include.php 它为程序建立起一个用户界面。

“include.php” 包含三个表单，一些PHP代码获取当前的目录列表并将它们存入三个变量
$files (包括当前目录下的文件）,
$file_sizes (相应的文件大小),
and $dirs (包含子目录名)

第一个表单使用$dirs 产生一个下拉式目录列表，对应于“action=CWD”。

第二个表单使用$files $file_sizes创建一个可用的文件列表，每一个文件使用一个checkbox。这个表单的action对应于”action=Delete” and “action=Download”

第三个表单用来上传一个文件到FTP站点，如下：
——————————————————————————–
<form enctype=”multipart/form-data” action=actions.php4 method=post>
…
<input type=file name=upfile>
…
</form>
——————————————————————————–
当PHP以这种方式接收到一个文件名，一些变量就产生了，这些变量指定文件的大小，一个临时的文件名以及文件的类型，最初的文件名存在$upfile_name，一旦上传后文件名便存入$upfile中（这个变量是由PHP自己创建的）
通过这些信息，我们就可以创建以下的语句了：
——————————————————————————–
ftp_put($result, $upfile_name, $upfile, FTP_BINARY);
——————————————————————————–
以下是代码列表：
——————————————————————————–
<!– code for index.html begins here –>
<html>
<head>
<basefont face=arial>
</head>

<body>

<table border=0 align=center>
<form action=”actions.php” method=post>
<input type=hidden name=action value=CWD>
<tr>
<td>
Server
</td>
<td>
<input type=text name=server>
</td>
</tr>

<tr>
<td>
Password
</td>
<td>
<input type=password name=password>
</td>
</tr>

</form>
</table>

</body>
</html>

<!– code for index.html ends here –>
——————————————————————————–
——————————————————————————–
<!– code for actions.php begins here –>

<?
/*
——————————————————————————–
DISCLAIMER:

This is use-at-your-own-risk code.

It is meant only for illustrative purposes and is not meant for production environments. No warranties of any kind are provided to the user.

You have been warned!

All code copyright Melonfire, 2000. Visit us at http://www.melonfire.com
——————————————————————————–
*/

// function to connect to FTP server
function connect()
{
global $server, $username, $password;
$conn = ftp_connect($server);
ftp_login($conn, $username, $password);
return $conn;
}

// main program begins

// check for valid form entries else print error
if (!$server
!$username
!$password)
{
echo “Form data incomplete!”;
}
else
{

// connect
$result = connect();

// action: change directory
if ($action == “CWD”)
{

// at initial stage $rdir does not exist
// so assume default directory
if (!$rdir)
{
$path = “.”;
}
// get current location $cdir and add it to requested directory $rdir
else
{
$path = $cdir . “/” . $rdir;
}

// change to requested directory
ftp_chdir($result, $path);

}

// action: delete file(s)
else if ($action == “Delete”)
{

ftp_chdir($result, $cdir);

// loop through selected files and delete
for ($x=0; $x<sizeof($dfile); $x++)
{
ftp_delete($result, $cdir . “/” . $dfile[$x]);
}

}
// action: download files
else if ($action == “Download”)
{

ftp_chdir($result, $cdir);

// download selected files
// IMPORTANT: you should specify a different download location here!!
for ($x=0; $x<sizeof($dfile); $x++)
{
ftp_get($result, $dfile[$x], $dfile[$x], FTP_BINARY);
}

}
// action: upload file
else if ($action == “Upload”)
{

ftp_chdir($result, $cdir);

// put file

/*
a better idea would be to use
$res_code = ftp_put($result, $HTTP_POST_FILES[“upfile”][“name”],
$HTTP_POST_FILES[“upfile”][“tmp_name”], FTP_BINARY);
as it offers greater security
*/
$res_code = ftp_put($result, $upfile_name, $upfile, FTP_BINARY);

// check status and display
if ($res_code == 1)
{
$status = “Upload successful!”;
}
else
{
$status = “Upload error!”;
}

}

// create file list
$filelist = ftp_nlist($result, “.”);

// and display interface
include(“include.php”);

// close connection
ftp_quit($result);

}
?>

</body>
</html>

<!– code for actions.php ends here –>
——————————————————————————–
——————————————————————————–
<!– code for include.php begins here –>

// get current location
$here = ftp_pwd($result);

/*
since ftp_size() is quite slow, especially when working
on an array containing all the files in a directory,
this section performs an ftp_size() on all the files in the current
directory and creates three arrays.
*/

// array for files
$files = Array();

// array for directories
$dirs = Array();

// array for file sizes
$file_sizes = Array();

// counters
$file_list_counter = 0;
$dir_list_counter = 0;

// check each element of $filelist
for ($x=0; $x<sizeof($filelist); $x++)
{
if (ftp_size($result, $filelist[$x]) != -1)
{
// create arrays
$files[$file_list_counter] = $filelist[$x];
$file_sizes[$file_list_counter] = ftp_size($result, $filelist[$x]);
$file_list_counter++;
}
else
{
$dir_list[$dir_list_counter] = $filelist[$x];
$dir_list_counter++;
}
}

<!– header – where am I? –>
<center>
You are currently working in <b><? echo $here; ?></b>
<br>
<!– status message for upload function –>
<? echo $status; ?>
</center>
<hr>
<p>
<!– directory listing in drop-down list –>
Available directories:
<form action=actions.php method=post>

<!– these values are passed hidden every time –>
<!– a more optimal solution might be to place these in session
variables –>
<input type=hidden name=username value=<? echo $username; ?>>
<input type=hidden name=password value=<? echo $password; ?>>
<input type=hidden name=server value=<? echo $server; ?>>
<input type=hidden name=cdir value=<? echo $here; ?>>

<!– action to take when THIS form is submitted –>
<input type=hidden name=action value=CWD>

<!– dir listing begins; first item is for parent dir –>
<select name=rdir>
<option value=”..”><parent directory></option>

for ($x=0; $x<sizeof($dir_list); $x++)
{
echo “<option value=” . $dir_list[$x] . “>” . $dir_list[$x] . “</option>”;

}
?>

</select>
<input type=submit value=Go>
</form>

<hr>

<!– file listing begins –>

Available files:
<form action=actions.php method=post>

<!– these values are passed hidden every time –>
<input type=hidden name=server value=<? echo $server; ?>>
<input type=hidden name=username value=<? echo $username; ?>>
<input type=hidden name=password value=<? echo $password; ?>>
<input type=hidden name=cdir value=<? echo $here; ?>>

// display file listing with checkboxes and sizes
for ($y=0; $y<sizeof($files); $y++)
{
echo “<tr><td><input type=checkbox name=dfile[] value=” . $files[$y] .
“>”. $files[$y] . ” <i>(” . $file_sizes[$y] . ” bytes)</i><td>”;
}

?>
</table>

<!– actions for this form –>
<center>
<input type=submit name=action value=Delete>
<input type=submit name=action value=Download>
</center>
</form>
<p>

<hr>

<!– file upload form –>
File upload:
<form enctype=”multipart/form-data” action=actions.php method=post>

<!– these values are passed hidden every time –>
<input type=hidden name=username value=<? echo $username; ?>>
<input type=hidden name=password value=<? echo $password; ?>>
<input type=hidden name=server value=<? echo $server; ?>>
<input type=hidden name=cdir value=<? echo $here; ?>>