<?php

$obj = new StdClass;

$obj->prop = 'my default public property';  // Public by default, so
echo $obj->prop;                            // this will work


// Class with a private property 
class NotStdClass {
    private $prop = 'This is private';
}

$privateObj = new NotStdClass;
echo $privateObj->prop;        // This is private, so fatal error

my default public property
Fatal error: Cannot access private property NotStdClass::$prop on line 15