intern.php

<?php

class Foo {
    private $bar = 'chuck';

    public function __construct($name = 'max')
    {
        $this->bar = $name;
    }

    public function __toString()
    {
        return $this->bar;
    }
}

$test = new Foo;
echo $test;

$test = new Foo('adam');
echo $test;