php自动上传文件到ftp服务器 (有什么方法可以让PHP自动上传文件到FTP服务器？)

PHP自动上传文件到FTP服务器是一个常见需求，可以用于自动备份数据、自动上传文件等场景。在PHP中，可以使用FTP扩展库来实现自动上传文件到FTP服务器的功能。以下是一些方法可以让PHP自动上传文件到FTP服务器。

1. 使用PHP的FTP扩展库

PHP提供了FTP扩展库，使用该扩展库可以很方便的实现自动上传文件到FTP服务器的功能。 例如：

“`
$ftpserver = “ftp.example.com”;
$ftpusername = “yourusername”;
$ftppassword = “yourpassword”;
$ftpfolder = “/public_html/”;

$localfile = “local-file.jpg”;
$remotefile = “remote-file.jpg”;

$connid = ftpconnect($ftpserver) or die(“Couldn’t connect to $ftpserver”);
ftplogin($connid, $ftpusername, $ftppassword);
ftppasv($connid, true);

ftpchdir($connid, $ftp_folder);

$upload = ftpput($connid, $remotefile, $localfile, FTP_BINARY);

if($upload) {
echo “File uploaded successfully.”;
} else {
echo “Upload failed.”;
}
ftpclose($connid);
“`

2. 使用PHP的CURL库

PHP的CURL库是一个支持各种协议的多功能库，也可以用于上传文件到FTP服务器。例如：

“`
$ftpserver = ‘ftp.example.com’;
$ftpusername = ‘yourusername’;
$ftppassword = ‘yourpassword’;
$ftpfolder = ‘/public_html/’;

$localfile = ‘local-file.jpg’;
$remotefile = ‘remote-file.jpg’;

$ch = curlinit();
curlsetopt($ch, CURLOPTURL, “ftp://{$ftpserver}/{$ftpfolder}/{$remotefile}”);
curlsetopt($ch, CURLOPTUSERPWD, “{$ftpusername}:{$ftppassword}”);
curlsetopt($ch, CURLOPTUPLOAD, 1);
curlsetopt($ch, CURLOPTINFILE, fopen($localfile, “rb”));
curlsetopt($ch, CURLOPTINFILESIZE, filesize($localfile));
curlsetopt($ch, CURLOPTRETURNTRANSFER, 1);

$result = curl_exec($ch);
if($result) {
echo ‘File uploaded successfully.’;
} else {
echo ‘Upload failed.’;
}

curl_close ($ch);
“`

3. 使用PHP的SSH2库

PHP的SSH2库可以用于连接到FTP服务器并上传文件。例如：

“`
$ftpserver = ‘ftp.example.com’;
$ftpusername = ‘yourusername’;
$ftppassword = ‘yourpassword’;
$ftpfolder = ‘/public_html/’;

$localfile = ‘local-file.jpg’;
$remotefile = ‘remote-file.jpg’;

$connection = ssh2connect($ftpserver);
ssh2authpassword($connection, $ftpusername, $ftppassword);
$sftp = ssh2_sftp($connection);

$sftpfile = “ssh2.sftp://{$sftp}{$ftpfolder}/{$remotefile}”;
$file = fopen($sftpfile, ‘w’);

if(!$file) {
echo ‘Could not open remote file.’;
exit;
}

fwrite($file, filegetcontents($local_file));
fclose($file);
echo ‘File uploaded successfully.’;
“`

以上三种方法都可以用于自动上传文件到FTP服务器，根据需要选择适合自己的方法即可。