Pop\Pdf\Object\Object::getByteLength PHP Метод

    public function getByteLength()
    {
        return $this->calcByteLength($this);
    }

 public function testSetAndGetDef()
 {
     $o = new Object(5);
     $o->define('some def /Xobject something');
     $this->assertEquals('some def /Xobject something', $o->getDef());
     $this->assertTrue($o->isXObject());
     $this->assertEquals(40, $o->getByteLength());
 }