Php+sftp Upload and download of implementation files

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Recently developed a project to work with the bank, need to upload and download files. There is a certain requirement for file secrecy, so sftp is used. But the actual development, encountered a lot of problems, the online search for the tutorial and cases can not be used, but also times, copy, copy to. Finally in the continuous debugging after the implementation of the PHP file upload and download. is now recorded for informational purposes only.

1. Check the PHP version, download the corresponding SSH2 extension https://windows.php.net/downloads/pecl/releases/ssh2/, specific installation, trouble searching online. Phpinfo () Check if the installation is good. After the installation is successful, you can see the SSH2.

2. upload next Cut method available online (I believe you've seen it)

<? php//php environment must have ssh $strServer = "Server IP";//server IP $strServerPort = "22";//Port number • $strServerUsername = "* * *";//user name $ Strserverpassword = "* * *";//password//connect to server $resConnection = Ssh2_connect ($strServer, $strServerPort); if (Ssh2_auth_password ($resConnection, $strServerUsername, $strServerPassword)) {//initialize sftp $resSFTP = ssh2_sftp ($ resconnection); • echo $resSFTP; · Download file//1 $filename = ' D:\down '. Time (). TXT '; · $opts = Array (* ' http ' =>array (· ') Method ' = ' and ' GET ', • ' Timeout ' =>60,) · $context = Stream_context_create ($opts); $strData = file_get_contents ("ssh2.sftp://{$resSFTP}/var/testfile/abc.txt", false, $context); File_put_contents ($filename, $strData); 2 can also use copy ()//if (!copy ("ssh2.sftp://{$resSFTP}/dfr508/wun/ikea-logo.jpg", $filename)) {//echo ' download failed ' ;· //}·//--------------------------------------------------------------------------------------------------------- -----//Upload file//1//file_put_contents ("ssh2.sftp://{$resSFTP}/var/testfile/456.txt", ' d:/ab.txt '); 2You can also use copy () if (!copy ("D:/ab.txt", "ssh2.sftp://{$resSFTP}/var/testfile/up". Time (). TXT ") {echo ' upload failed ';}} else {echo "cannot authenticate to the server";}? >

But I follow the online tutorial, how also can not achieve, finally had to step by step to troubleshoot the cause.

         $strServer = "";//server IP                  $strServerPort = "";//port number      $strServerUsername = "";//username      $strServerPassword = "";// Password     //1 connection server           $resConnection = Ssh2_connect ($strServer, $strServerPort);             2 Verify             the connection if (Ssh2_auth_password ($resConnection, $strServerUsername, $strServerPassword)) {                 //3 initialize SFTP                      $ Ressftp = Ssh2_sftp ($resConnection);

First 3 steps are no problem.

Use copy, File_get_content, curl method to upload and download all reported 502 error. Check the path and other issues, no problem, but it is not successful.

It is later inferred that the file address on the SFTP server cannot be accessed.

"Ssh2.sftp://{$resSFTP}/var/testfile/abc.txt"

Now it's only possible to find a really usable address, see a lot of data, and finally find it in the PHP manual.

Ssh2_sftp_realpath checks the true path of the file, and finally returns the address of the file accessed after the SFTP connection. Incoming "ssh2.sftp://{$resSFTP}/var/testfile/abc.txt"

Will error, indicating that the address is wrong. Finally check out the upload, the download address does not need to add the previous

sh2.sftp://{$resSFTP}

Directly with the Sftp file path.

The upload function is also not available with the previously mentioned copy, file_get_content, Curl

Need to use

Ssh2_scp_send Upload

SSH2_SCP_RECV Download