php - cURL FTP Custom Commands: Run w/o returning dir index?

Solution:

So. There is an option for this after all. To exclude the response body from your cURL request:

curl_setopt($this->curl, CURLOPT_NOBODY, true);
Copy code

...does the trick. The command then returns an empty string or boolfalse if the command failed. Information on the last failed request is available withcurl_error($this->curl).

Now, some cURL responses to FTP commands are on the obscure side, displaying e.g.QUOT command failed with 550 (for failed rename attempt), while the actual FTP transaction was:

> RNFR /foox/test.txt
< 550 file/directory not found
* QUOT command failed with 550
Copy code

Which is a lot more informative as far as what went wrong. Then set theCURLOPT_VERBOSE option. If you don't want to log either to a file or to stdout (= on-screen), here's a handy way to capture the response into a temporary stream. (N.B. we're working within a wrapper class/object here.)

curl_setopt(CURLOPT_VERBOSE, true);
$this->stream_log = fopen('php://temp', 'r+b');
curl_setopt(CURLOPT_STDERR, $this->stream_log);
Copy code

...and something like the following in your log fetcher method:

rewind($this->stream_log);
return stream_get_contents($this->stream_log);
Copy code

Makes cURL transaction debugging a lot easier. Further, if you want to get just the relevant segment of the log, here's a quick regex that helps ($cmd being the command you sent, starting the match):

preg_match("#(> {$cmd}(.*?))\\v\*#s", $log, $m);
return $m ? $m[1] : '';
Copy code

When my FTP cURL wrapper for PHP is done and dusted, will make available. Happy cURLing y'all.