PageToJson

<?php

/**
 * ProcessWire 'Hello world' demonstration module
 *
 * Demonstrates the Module interface and how to add hooks.
 * 
 * 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
 * 
 * http://processwire.com/talk/topic/4887-additional-buttons-on-page-edit/
 */

class PageToJson 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(

			'title' => 'Page to Json', 
			'version' => 101, 
			'summary' => 'Converts this page to json.',
			'href' => 'http://www.processwire.com',
			'singular' => true, 
			'autoload' => true, 
			);
	}

	public function init() {

		$this->addHook('ProcessPageEdit::buildForm', $this, 'addButton');
	}


    public function addButton(HookEvent $event) {

    	// only superuser is allowed to convert to json
		if(!wire("user")->hasRole("superuser")) return;

		$array = array();            
        
        // fields to be avoided
        $avoid = array("FieldtypeFieldsetOpen", "FieldtypeFieldsetClose");

        // get actual page
    	$page = wire(pages)->get($this->input->get->id);


		// loop through all fields
		foreach($page->fields as $field) {
			if (!in_array($field->type, $avoid)) {
				$array[$field->name] = htmlentities($page->get($field->name));
			}
		}

		// convert to json
		echo json_encode(array($page->name =>$array));

		// CREATE BUTTON
        $href = $this->config->urls->admin.'page/edit/?id='.$this->input->get->id.'&e=1';           
        $field = $this->modules->get('InputfieldButton');
        $field->attr('id+name', 'email_customer');
        $field->attr('class', $field->class);
        $field->attr('value', 'page to json');
        $field->attr('href',$href);

        $event->return = $event->return->append($field);
    }


}