For example, you can use it for SOAPClient: stackoverflow.com/questions/3444359/is-it-possi...
Or for common purposes: ilia.ws/archives/51-PHP-bind-support-via-stream...

  1. <?php
  2.  
  3. $conn = stream_context_create(array('socket'=>array('bindto' => "1.2.3.4:0")));
  4. file_get_contents("url";, NULL, $conn);
  5.  
  6. ?>