Question

I wonder what is advantage of using InvalidArgumentException instead Exception?
Does it for increasing code readibility or there are another reasons for that?

public function setShortName($shortName){
    $shortName = (string) $shortName;
    if (strlen( $shortName ) == 2) {
        $this->_shortName = (string) $shortName;
    } else {
        throw new InvalidArgumentException( "Ülke kısa ismi 2 karakterden oluşmak zorundadır", 115003 );
    }
}

or

public function setShortName($shortName){
    $shortName = (string) $shortName;
    if (strlen( $shortName ) == 2) {
        $this->_shortName = (string) $shortName;
    } else {
        throw new Exception( "Ülke kısa ismi 2 karakterden oluşmak zorundadır", 115003 );
    }
}

Answer 1

It’s for better readability/debugging and for processing right block of code e.g. in try-catch block…

try {
  // some code with potential exception throwing block
} catch(InvalidArgumentException $ex) {
  // handling InvalidArgumentException
} catch(AnotherException $ex) {
  // handling AnotherException
} catch(Exception $ex) {
  // handling Exception
} finally {
  // always-processed code
}

Note that exceptions have tree-based structure so handling depends on their order! (from lowest to root)

for more information: http://docs.oracle.com/javase/7/docs/api/java/lang/package-tree.html