第三步：创建PHP上传处理程序
一旦表单被提交给了Web服务器，下一步（也是最后一步）是使用PHP的FTP函数按照用户提供的访问信任书把它传输到目标服务器上。下面就是完成上述所有工作的脚本（upload.php），见列表C：
来源:http://www.002pc.com/master/College/Programming/PHP/2008-11-27/3948.html
<?php
// get FTP access parameters
$host = $_POST['host'];
$user = $_POST['user'];
$pass = $_POST['pass'];
$destDir = $_POST['dir'];
$workDir = "/usr/local/temp"; // define this as per local system
// get temporary file name for the uploaded file
$tmpName = basename($_FILES['file']['tmp_name']);
// copy uploaded file into current directory
move_uploaded_file($_FILES['file']['tmp_name'], $workDir."/".$tmpName) or die("Cannot move uploaded file to working directory");
// open connection
$conn = ftp_connect($host) or die ("Cannot initiate connection to host");
// send access parameters
ftp_login($conn, $user, $pass) or die("Cannot login");
// perform file upload
$upload = ftp_put($conn, $destDir."/".$_FILES['file']['name'], $workDir."/".$tmpName, FTP_BINARY);
// check upload status
// display message
if (!$upload) {
echo "Cannot upload";
} else {
echo "Upload complete";
}
// close the FTP stream
ftp_close($conn);
// delete local copy of uploaded file
unlink($workDir."/".$tmpName) or die("Cannot delete uploaded file from working directory -- manual deletion recommended");
?>
这看起来很复杂，但是事实上相当简单。下面就是实际发生的事情：