[PHP] destructor not called for static members?

[Robert Janeczek]

am i missing something or destructor isn`t called for objects that are 
assigned to static fields in other objects? here is some example code:
<?php
class c1 {
  public function __destruct() {
    echo '__destruct';
  }
}

class c2 {
  private static $_ref;
  public function __construct() {
    self::$_ref = new c1();
    //$this->_ref =  new c1();
  }
}
$obj = new c2();
unset($obj);
?>
i thought this should display __destruct in both cases from 
c2::__construct, but only the one with non static access seems to call 
c1::destruct. and if i remove unsetting $obj from the end of code this 
one also doesn`t work. is it expected behaviour? or maybe when 
__destructor is called after script finishes execution than output is no 
longer possible? i tried also send some information to file and this 
also didn`t work. help please :)

php 5.0.3
rash
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