Scope Resolution Operator-:: | Learning Curve- Perfect Tutorial for the beginers

Double colon (::) this is used to access the static,constant and overridden properties or methods of a class.

Example1
——–

<?php

class mydoubts{


const mydoubts_val='mydoubts.in';

}

$classname='mydoubts';
echo $classname::mydoubts_val;
echo mydoubts::mydoubts_val;

?>

<?php

class mydoubts{

const mydoubts_val='mydoubts.in';

}

$classname='mydoubts';

echo $classname::mydoubts_val;

echo mydoubts::mydoubts_val;

self,parent and static are used to access the value inside the class

Example2
——–

<?php

Class Vasanthan extends mydoubts
{

  public static $inside_val='hello vasanthan';
  
  public static function innerdisplay()

   {
      echo parent::mydoubts_val;

      echo self::$inside_val;

   }

       $classname='Vasanthan';
    echo $classname::innerdisplay();

 Vasanthan::innerdisplay();

}

?>

<?php

Class Vasanthan extends mydoubts

{

public static $inside_val='hello vasanthan';

public static function innerdisplay()

{

echo parent::mydoubts_val;

echo self::$inside_val;

}

$classname='Vasanthan';

echo $classname::innerdisplay();

Vasanthan::innerdisplay();

}