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php实现文件传输

2026-01-29 06:03:11PHP

PHP 实现文件传输的方法

使用 `move_uploaded_file` 函数上传文件

在 HTML 表单中设置 enctype="multipart/form-data"，通过 $_FILES 超全局变量获取上传的文件信息。

<form action="upload.php" method="post" enctype="multipart/form-data">
    <input type="file" name="fileToUpload">
    <input type="submit" value="Upload File">
</form>

在 PHP 脚本中处理上传的文件：

$targetDir = "uploads/";
$targetFile = $targetDir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;

if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $targetFile)) {
    echo "The file " . htmlspecialchars(basename($_FILES["fileToUpload"]["name"])) . " has been uploaded.";
} else {
    echo "Sorry, there was an error uploading your file.";
}

使用 FTP 传输文件

通过 PHP 的 FTP 函数库可以实现文件传输到远程服务器。

$ftpServer = "ftp.example.com";
$ftpUsername = "username";
$ftpPassword = "password";
$localFile = "localfile.txt";
$remoteFile = "remotefile.txt";

$connId = ftp_connect($ftpServer);
$loginResult = ftp_login($connId, $ftpUsername, $ftpPassword);

if (ftp_put($connId, $remoteFile, $localFile, FTP_BINARY)) {
    echo "Successfully uploaded $localFile to $remoteFile";
} else {
    echo "There was a problem while uploading $localFile";
}

ftp_close($connId);

使用 cURL 发送文件

通过 cURL 可以发送文件到远程服务器。

$url = "http://example.com/upload.php";
$filePath = "localfile.txt";

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, [
    'file' => new CURLFile($filePath)
]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$response = curl_exec($ch);
curl_close($ch);

echo $response;

使用 `file_put_contents` 下载文件

通过 PHP 可以下载远程文件到本地服务器。

$fileUrl = "http://example.com/remote/file.txt";
$localPath = "local/file.txt";

$fileContent = file_get_contents($fileUrl);
if ($fileContent !== false) {
    file_put_contents($localPath, $fileContent);
    echo "File downloaded successfully";
} else {
    echo "Failed to download file";
}

使用 SSH2 传输文件

通过 SSH2 扩展可以在安全通道中传输文件。

$sshHost = "example.com";
$sshUsername = "username";
$sshPassword = "password";
$localFile = "localfile.txt";
$remoteFile = "remotefile.txt";

$connection = ssh2_connect($sshHost, 22);
ssh2_auth_password($connection, $sshUsername, $sshPassword);

if (ssh2_scp_send($connection, $localFile, $remoteFile)) {
    echo "File transferred successfully";
} else {
    echo "File transfer failed";
}

ssh2_disconnect($connection);