(PHP 5)
ReflectionClass::getDefaultProperties — Gets default properties
Gets default properties from a class (including inherited properties).
This function has no parameters.
   An array of default properties, with the key being the name of
   the property and the value being the default value of the property or NULL
   if the property doesn't have a default value. The function does not distinguish
   between static and non static properties and does not take visibility modifiers
   into account.
  
Example #1 ReflectionClass::getDefaultProperties() example
<?php
class Bar {
    protected $inheritedProperty = 'inheritedDefault';
}
class Foo extends Bar {
    public $property = 'propertyDefault';
    private $privateProperty = 'privatePropertyDefault';
    public static $staticProperty = 'staticProperty';
    public $defaultlessProperty;
}
$reflectionClass = new ReflectionClass('Foo');
var_dump($reflectionClass->getDefaultProperties());
?>
The above example will output:
array(5) {
   ["staticProperty"]=>
   string(14) "staticProperty"
   ["property"]=>
   string(15) "propertyDefault"
   ["privateProperty"]=>
   string(22) "privatePropertyDefault"
   ["defaultlessProperty"]=>
   NULL
   ["inheritedProperty"]=>
   string(16) "inheritedDefault"
}