Plus sign changing to space in html form

When i post a string containing plus sign with htmp form to a php scritp, the '+' is changed to space. e.g: i enter 'as+df' to a text input but $_POST[] returns 'as df' instead. It must be in php or apache configuration bcause i have this problem only on sytem with FreeBSD. On windows it works as expected. Know someone how could i make the '+' left intact? Please help. <? echo $_POST['test']; ?> <form actiom='test.php' method=POST> <input type=text value='' name=test> <input type=submit value='submit'> </form>