Horde_Mime_Part::setDuration PHP Method

    public function setDuration($duration)
    {
        if (is_null($duration)) {
            unset($this->_headers['content-duration']);
        } else {
            if (!($hdr = $this->_headers['content-duration'])) {
                $hdr = new Horde_Mime_Headers_Element_Single('Content-Duration', '');
                $this->_headers->addHeaderOb($hdr);
            }
            $hdr->setValue($duration);
        }
    }

 public function testNullCharactersNotAllowedInMimeHeaderData()
 {
     $part = new Horde_Mime_Part();
     $part->setType("text/plain");
     $this->assertEquals('text/plain', $part->getType());
     $part->setDisposition("inline");
     $this->assertEquals('inline', $part->getDisposition());
     $part->setDispositionParameter('size', '123' . "" . '456');
     $this->assertEquals(123456, $part->getDispositionParameter('size'));
     $part->setDispositionParameter('foo', "foobar");
     $this->assertEquals('foobar', $part->getDispositionParameter('foo'));
     $part->setCharset("utf-8");
     $this->assertEquals('utf-8', $part->getCharset());
     $part->setName("foobar");
     $this->assertEquals('foobar', $part->getName());
     $this->assertEquals('foobar', $part->getDispositionParameter('filename'));
     $this->assertEquals('foobar', $part->getContentTypeParameter('name'));
     $part->setLanguage("en");
     $this->assertEquals(array('en'), $part->getLanguage());
     $part->setLanguage(array("en", "de"));
     $this->assertEquals(array('en', 'de'), $part->getLanguage());
     $part->setDuration('123' . "" . '456');
     $this->assertEquals(123456, $part->getDuration());
     $part->setBytes('123' . "" . '456');
     $this->assertEquals(123456, $part->getBytes());
     $part->setDescription("foobar");
     $this->assertEquals('foobar', $part->getDescription());
     $part->setContentTypeParameter('foo', "foobar");
     $this->assertEquals('foobar', $part->getContentTypeParameter('foo'));
     $part->setContentId("foobar");
     $this->assertEquals('foobar', $part->getContentId());
 }