Related issues with DSN

Questions about DSN
The recent use of DSN in the CodeIgniter database connection, but no matter what the port number changes to always be able to connect successfully, and modify the user name, password or IP address, there will be a connection failure problem, the following is my Code

PHP Code

  
      function Get_remote_dblist ($ip, $port, $user, $pwd) {        $dsn = "mysql://$user: $pwd @ $ip: $port";        $newDB = $this->load->database ($DSN, TRUE); return $newDB->version ();}

Please show your predecessors

------Solution--------------------
The official documentation for CI does not mention that the host name in the DSN can be appended with the port number. There's a compromise method you can try.

PHP Code

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