Transfer in-memory data to FTP server without using intermediate file

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The file_put_contents is the easiest solution:

file_put_contents('ftp://username:pa‌​ssword@hostname/path/to/file', $contents);

If it does not work, it’s probably because you do not have URL wrappers enabled in PHP.

If you need greater control over the writing (transfer mode, passive mode, offset, reading limit, etc), use the ftp_fput with a handle to the php://temp (or the php://memory) stream:

$conn_id = ftp_connect('hostname');

ftp_login($conn_id, 'username', 'password');
ftp_pasv($conn_id, true);

$h = fopen('php://temp', 'r+');
fwrite($h, $contents);
rewind($h);

ftp_fput($conn_id, '/path/to/file', $h, FTP_BINARY, 0);

fclose($h);
ftp_close($conn_id);

(add error handling)

Or you can open/create the file directly on the FTP server. That’s particularly useful, if the file is large, as you won’t have keep whole contents in memory.

See Generate CSV file on an external FTP server in PHP.

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