DSL in PHP sample. See Entity::customize method.

dsl_sample.php

<?php
class HackObject
{
    public $_entityName;
    public $_attributeNames;
    function entityName($val) { $func = $this->_entityName; $func($val); }
    function attributeNames($val) { $func = $this->_attributeNames; $func($val); }
}

class EntityBase
{
    static $entityName = 'entity_base';
    static $attributeNames = array('attr','name');
    static private function hacker() {
        $hack = new HackObject;
        $entity_name =& static::$entityName;
        $hack->_entityName = function($val) use (&$entity_name) { $entity_name = $val; };
        $attr_names =& static::$attributeNames;
        $hack->_attributeNames = function($val) use (&$attr_names) { $attr_names = $val; };
        return $hack;
    }
    static function createEntity() {
        static::customize(static::hacker());
        return new static;
    }
}

class Entity extends EntityBase
{
    static function customize($let) {
        $let->entityName('another_name');
        $let->attributeNames(array('another','attr','name'));
    }
}

$ent = Entity::createEntity();
assert('another_name' === $ent::$entityName);
assert(array('another','attr','name') === $ent::$attributeNames );