Command delete_dir doesn't work

[kinesra75]

I just replace :

$result = @ssh2_sftp_rmdir($this->conn_id, $filepath);

by

$sftp = $this->conn_sftp;
$result = rmdir("ssh2.sftp://$sftp$filepath");

to make it work, I don't know why ssh2_sftp_rmdir doesn't do the job.