使用PHP上传文件到FTP服务器

登录FTP服务器后，使用ftp_put()函数上传服务器上的文件。

//FTP server details
$ftpHost   = 'ftp.example.com';
$ftpUsername = 'ftpuser';
$ftpPassword = '*';
//open an FTP connection
$connId = ftp_connect($ftpHost) or die("Couldn't connect to $ftpHost");
//login to FTP server
$ftpLogin = ftp_login($connId, $ftpUsername, $ftpPassword);
//local & server file path
$localFilePath  = 'index.php';
$remoteFilePath = 'public_html/index.php';
//try to upload file
if(ftp_put($connId, $remoteFilePath, $localFilePath, FTP_ASCII)){
    echo "File transfer successful - $localFilePath";
}else{
    echo "There was an error while uploading $localFilePath";
}
//close the connection
ftp_close($connId);

使用PHP删除 FTP 服务器上的文件

登录FTP服务器后，使用ftp_delete()函数删除服务器上的文件。

//FTP server details
$ftpHost   = 'ftp.example.com';
$ftpUsername = 'ftpuser';
$ftpPassword = '*';
//open an FTP connection
$connId = ftp_connect($ftpHost) or die("Couldn't connect to $ftpHost");
//login to FTP server
$ftpLogin = ftp_login($connId, $ftpUsername, $ftpPassword);
//server file path
$file = 'public_html/index_old.php';
//try to delete file on server
if(ftp_delete($connId, $file)){
    echo "$file deleted successful";
}else{
    echo "There was an error while deleting $file";
}
//close the connection
ftp_close($connId);

使用PHP连接并登录到 FTP 服务器

首先，使用 ftp_connect() 函数连接到 FTP 服务器。
创建FTP连接后，使用ftp_login()函数通过FTP用户名和密码登录FTP服务器。

//FTP server details
$ftpHost   = 'ftp.example.com';
$ftpUsername = 'ftpuser';
$ftpPassword = '*';
//open an FTP connection
$connId = ftp_connect($ftpHost) or die("Couldn't connect to $ftpHost");
//try to login
if(@ftp_login($connId, $ftpUsername, $ftpPassword)){
    echo "Connected as $ftpUsername@$ftpHost";
}else{
    echo "Couldn't connect as $ftpUsername";
}
//close the connection
ftp_close($connId);

PHP 提供了各种功能来与 FTP 服务器一起工作。
在本教程中，将向我们展示如何使用 PHP 连接 FTP 服务器以及使用 PHP 处理 FTP 服务器上的文件所需的最必需的功能。

使用PHP从 FTP 服务器下载文件

登录FTP服务器后，使用ftp_get()函数从服务器下载文件。

//FTP server details
$ftpHost   = 'ftp.example.com';
$ftpUsername = 'ftpuser';
$ftpPassword = '*';
//open an FTP connection
$connId = ftp_connect($ftpHost) or die("Couldn't connect to $ftpHost");
//login to FTP server
$ftpLogin = ftp_login($connId, $ftpUsername, $ftpPassword);
//local & server file path
$localFilePath  = 'index.php';
$remoteFilePath = 'public_html/index.php';
//try to download a file from server
if(ftp_get($connId, $localFilePath, $remoteFilePath, FTP_BINARY)){
    echo "File transfer successful - $localFilePath";
}else{
    echo "There was an error while downloading $localFilePath";
}
//close the connection
ftp_close($connId);