Overload Constructor in PHP

gistfile1.txt

<?php

    class myClass {

        public $param1 = 'a';
        public $param2 = 'b';

        public function __construct($param1 = NULL, $param2 = NULL) {

            if ($param1 == NULL && $param2 == NULL) {
//                $this->param1 = $param1;
//                $this->param2 = $param2;
            } elseif ($param1 == NULL && $param2 !== NULL) {
//                $this->param1 = $param1;
                $this->param2 = $param2;
            } elseif ($param1 !== NULL && $param2 == NULL) {
                $this->param1 = $param1;
//                $this->param2 = $param2;                
            } else {
                $this->param1 = $param1;
                $this->param2 = $param2;
            }

        }

    }

//    $myObject  = new myClass();
//    $myObject  = new myClass(NULL, 2);
    $myObject  = new myClass(1, '');
//    $myObject  = new myClass(1, 2);

    echo $myObject->param1;
    echo "<br />";
    echo $myObject->param2;

?>

https://stackoverflow.com/questions/2169448/why-cant-i-overload-constructors-in-php/51908855#51908855