[php] What is function overloading and overriding in php?

Overloading Example

class overload {
    public $name;
    public function __construct($agr) {
        $this->name = $agr;
    }
    public function __call($methodname, $agrument) {
         if($methodname == 'sum2') {

          if(count($agrument) == 2) {
              $this->sum($agrument[0], $agrument[1]);
          }
          if(count($agrument) == 3) {

              echo $this->sum1($agrument[0], $agrument[1], $agrument[2]);
          }
        }
    }
    public function sum($a, $b) {
        return $a + $b;
    }
    public function sum1($a,$b,$c) {

        return $a + $b + $c;
    }
}
$object = new overload('Sum');
echo $object->sum2(1,2,3);

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