add page field as property to page example

AddPageFieldProperty.module

<?php

/**
 * ProcessWire AddPageFieldProperty demonstration module
 *
 *
 * ProcessWire 2.x
 * Copyright (C) 2010 by Ryan Cramer
 * Licensed under GNU/GPL v2, see LICENSE.TXT
 *
 * http://www.processwire.com
 * http://www.ryancramer.com
 *
 */

class AddPageFieldProperty extends WireData implements Module {

	/**
	 * getModuleInfo is a module required by all modules to tell ProcessWire about them
	 *
	 * @return array
	 *
	 */
	public static function getModuleInfo() {

		return array(

			// The module'ss title, typically a little more descriptive than the class name
			'title' => 'AddPageFieldProperty',

			// version: major, minor, revision, i.e. 100 = 1.0.0
			'version' => 101,

			// summary is brief description of what this module is
			'summary' => 'An example module.',
			'singular' => true,
			'autoload' => true,
			);
	}

	/**
	 * Initialize the module
	 *
	 * ProcessWire calls this when the module is loaded. For 'autoload' modules, this will be called
	 * when ProcessWire's API is ready. As a result, this is a good place to attach hooks.
	 *
	 */
	public function init() {
 		// exclude hook from admin urls
		if(isset($_GET['it']) && strpos($_GET['it'], ltrim($this->config->urls->admin,"/")) !== false) return;
		
		// add a hook before rendering a page to modify it before sent to template output
		$this->addHookBefore('Page::render', $this, 'addProperty');

	}

	/**
	 * add property to a certain page to add selected "option name"
	 * 
	 * if($page->somepagefield->optionname) { ... }
	 * where "optionname" is the name of the selected page in the page field "somepagefield"
	 * 
	 * @param HookEvent $event event object
	 */
	public function addProperty(HookEvent $event){
		$page = $event->object;
		//if($page->template != "basic-page") return;
		
		// check for if a page field is set and is not empty
		if(count($page->somepagefield)){
			foreach($page->somepagefield as $l){
				$page->set("$l->name",true); // set property to page temporarely
			}
		}
		// add more other checks to your needs
	}


}