Overloading and Overriding in php

Overloading in PHP

class overloading {

    public $methodName;

    public function __construct($argu) {

        $this->methodName = $argu;

    }

    public function __call($methodname, $agru) {

         if($methodname == 'sum2') {

          if(count($agru) == 2) {

              $this->sum($agru[0], $agru[1]);

          }

          if(count($agrument) == 3) {

              echo $this->sum1($agru[0], $agru[1], $agru[2]);

          }

        }

    }

    public function sum($a, $b) {

        return $a + $b;

    }

    public function sum1($a,$b,$c) {

        return $a + $b + $c;

    }

}

$object = new overloading('Sum');

echo $object->sum2(1,2,3);//6

Overriding in PHP

<?php

class A {

   function print() {

      return "print::1";

   }

}

class B extends A {

   function print() {

      return "print::2";

   }

}

$foo = new A;

$bar = new B;

echo($foo->print()); //"print::1"

echo($bar->print()); //"print::2"

?>