The content of this article is about PHP connecting sftp to realize file upload and download. It has a certain reference value. Now I share it with everyone. Friends in need can refer to it

Recently developed a project to cooperate with banks Projects require uploading and downloading files. There are certain requirements for file confidentiality, so SFTP is used. However, in actual development, we encountered many problems. The tutorials and cases found online could not be used, and they were copied over and over again. Finally, after constant debugging, the file upload and download of PHP was finally realized. It is recorded now for reference only.

1. Check the PHP version and download the corresponding ssh2 extension https://windows.php.net/downloads/pecl/releases/ssh2/ . For specific installation, please search online. phpinfo() checks whether it is installed. After the installation is successful, you can see ssh2.

2. The upload and download method provided on the Internet (I believe you must have seen it)

<·?·php
//php环境中必须有ssh
·$strServer = "服务器ip";//服务器ip
·$strServerPort = "22";//端口号
·$strServerUsername = "***";//用户名
·$strServerPassword = "***";//密码
·//connect to server
·$resConnection = ssh2_connect($strServer, $strServerPort);
·if(ssh2_auth_password($resConnection, $strServerUsername, $strServerPassword)){
·//初始化 SFTP
·$resSFTP = ssh2_sftp($resConnection);
·echo $resSFTP;
·//下载文件
·//1
·$filename = &#39;D:\down&#39;.time().&#39;.txt&#39;;
·$opts = array(
·&#39;http&#39;=>array(
·&#39;method&#39;=>"GET",
·&#39;timeout&#39;=>60,
·)
·);
·$context = stream_context_create($opts);
·$strData = ·file_get_contents("ssh2.sftp://{$resSFTP}/var/testfile/abc.txt", false, $context);
·file_put_contents($filename, $strData);
·//2 也可以用copy()
·//if(!copy("ssh2.sftp://{$resSFTP}/dfr508/WUN/ikea-logo.jpg", $filename)) {
·// echo &#39;download failed&#39;;
·//}
·//--------------------------------------------------------------------------------------------------------------
·//上传文件
·//1
·//file_put_contents("ssh2.sftp://{$resSFTP}/var/testfile/456.txt", &#39;D:/ab.txt&#39;);
·//2也可以用copy()
·if(!copy("d:/ab.txt", "ssh2.sftp://{$resSFTP}/var/testfile/up".time().".txt")) {
·echo &#39;upload failed&#39;;
·}
·} else {
·echo "无法在服务器进行身份验证";
·}
·?·>

But I follow the online method The tutorial couldn't be implemented no matter what, so in the end I had to find out the reason step by step.

         $strServer = "";//服务器ip         
         $strServerPort = "";//端口号     
         $strServerUsername = "";//用户名     
         $strServerPassword = "";//密码    
         //1连接服务器          
         $resConnection = ssh2_connect($strServer, $strServerPort);        
         //2验证连        
         if(ssh2_auth_password($resConnection, $strServerUsername, $strServerPassword)){            
         //3初始化 SFTP            
         $resSFTP = ssh2_sftp($resConnection);

First of all, there is no problem in the first three steps.

Using the copy, file_get_content, curl methods to achieve uploading and downloading will report a 502 error. I checked the path and other issues, and there was no problem, but it just couldn't succeed.

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

"ssh2.sftp://{$resSFTP}/var/testfile/abc.txt"

Now we can only find the truly available address , checked a lot of information, and finally found

ssh2_sftp_realpath in the PHP manual. Check the real path of the file, and finally return the address of the file accessed after connecting to SFTP. Passing in "ssh2.sftp://{$resSFTP}/var/testfile/abc.txt"

will report an error, indicating that this address is wrong. Finally, check out the upload. The download address does not need to be preceded by

sh2.sftp://{$resSFTP}

and directly uses the SFTP file path.

The functions used for uploading cannot be used. The previously mentioned copy, file_get_content, curl

need to be uploaded using

ssh2_scp_send

ssh2_scp_recv Download

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Detailed explanation of PHP connection pool

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