SSH Connection from CodeIgniter

Test.php

<?php

class Test extends CI_Controller
{
  public function deploy_test() {
      $connection = ssh2_connect("123.45.67.890", 23);
  
      if(!$connection) {
         echo json_encode('Connection failed');
      }
  
      ssh2_auth_password($connection, "username", "password");
      $stream = ssh2_exec($connection, "ls -l");
      stream_get_blocking($stream, true);
      $output = "";
      while($line = fgets($stream)) {
          $output .= $line;
      }
      echo json_encode($line);
  }
}

Personally I think you'd be better off using phpseclib, a pure PHP SSH implementation. The following URL makes a pretty compelling case for it:

http://stackoverflow.com/questions/14304234/phpseclib-or-ssh2-pecl-extension?lq=1

you have a typo on "stream_set_blocking "