Selector with classes

file1.php

<?php
/* Plugin Name Some Code */
class PluginInit
{
	/**
	 * mocking code
	 */
	CONST WP_VERSION = '3.3';
	private function get_wp_version(){ return '3.3' ; }
	private function get_wp_network() { return false; }
	/*// end mocking code */

	private $_classname = '';

	public function __construct(){
		// check versions
		$_wp_version  = (int) version_compare( self::WP_VERSION, $this->get_wp_version(), '>=' );
		$_network = (int) $this->get_wp_network();

		$resources = new stdClass();
		$resources->wp = array( 'wp30', 'wp33' );
		$resources->network = array( 'nonetwork', 'network' );

		$this->_classname = $resources->wp[$_wp_version] . $resources->network[$_network];
		
		$this->do_something();
	}
	
	private function do_something(){
		$class = &$this->_classname;
		
		$c = new $class;
		$c->test();
		$c::test2();
	}
}

new PluginInit();

class wp33nonetwork
{
	public $classname = __CLASS__;
	
	public function __construct(){
			echo 'WordPress Version größer-gleich 3.3, kein Netzwerk<br />';
	}
	
	public static function test(){
		printf( "Wir sind in der Klasse <strong>%s</strong><br />", __CLASS__ );
	}
	
	public function test2(){
		printf( "Dies ist die Methode <strong>%s</strong><br />", __METHOD__ );
	}
}

class wp33network {}

class wp30nonetwork {}

class wp30network {}