[SOLVED] basic question about operators "::"

[mare70]

What does "::"

example code:

 

  $settings = Dbvars::getSettings();

[Darklink]

You mean, "what does :: do/mean?"?

 

It's the same as -> I believe.

[mare70]

yes,"what does is do/mean?"?

[mare70]

if "::"same like "-> " when i shoud use it.

thanks

[DarkWater]

It's not the same as ->.  It's a scope resolution operator.  It's often used to perform a method of a given class in a static context, but it's also used when referring to self::, parent::, etc.  For example:

 

class Database {

    protected $instance;

    protected function __construct() {

        //do some stuff

    }

    public static function getInstance() {

       if (!$this->instance) {

              $this->instance = new self();

       }

       return $this->instance;

   }

}

 

Then you could do:

 

$db = Database::getInstance();

[mare70]

ok,thanks !

do you know for some good tutorial on this subject

[cooldude832]

google.com->php OOP tutorial-> enter-> read

 

Of course if you don't have basic php down OOP isn't much help to you.

[DarkWater]

It's used in a computer paradigm called object-oriented programming.  There's plenty of books and articles and tutorials on the subject.  There are even 3 on this very site on the home page that are pretty well-written.  Start with those (starting with number 1, of course).

[mare70]

thanks