Consider this:

class foo
{
  var $con;

  function foo //constructor
  {
    $this->con = imap_open (...);
  }

  function bar
  {
    $other = imap_open (...);
    imap_do_something ($other, ....);
    imap_close ($other);
  }

  function destroy
  {
    imap_do_something($this->con, ....);
    imap_close ($this->con);
  }

$test = new foo();
$test->bar();
$test->destroy();

well, when I open the second IMAP connection ($other), everything works OK. After that, though, if I call some function with the first connection ($this->con) nothing works. Any ideas?