Horde_Url_Data::isData PHP Method

    public static function isData($input)
    {
        if (is_object($input)) {
            return $input instanceof self;
        }
        return is_string($input) && strpos($input, 'data:') === 0;
    }

 public function testIsData()
 {
     $this->assertFalse(Horde_Url_Data::isData(new Horde_Url()));
     $this->assertFalse(Horde_Url_Data::isData('foo'));
     $this->assertFalse(Horde_Url_Data::isData(333));
     $this->assertFalse(Horde_Url_Data::isData(array(new Horde_Url_Data())));
     $this->assertTrue(Horde_Url_Data::isData(new Horde_Url_Data()));
     $this->assertTrue(Horde_Url_Data::isData('data:text/plain,Foo'));
 }