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Home , CodeIgniter, Front controller, Kohana (framework), Pop PHP Framework, PRADO (framework)

Introduction to CodeIgniter Ed Finkler • http://funkatron.com • @funkatron codeworks09 Thee Agenda

Why CodeIgniter? The CI MVC Model CI Basics Running CI out of the box Making a basic web app Making a web api http://www.flickr.com/photos/alternatewords/2332580309/ Why CodeIgniter? Why not CakePHP or Zend Framework or Limonade or or Solar or or Zoop or or Akelos or PHP on Trax or Prado or Seagull? Because you've gotta pick one, dammit All of them have value That being said, CI is…

Easy to understand Simple doesn't require advanced OOP Doesn't force lots of conventions Plays well with others Quick to get up and running Good docs and great community Backed by invested entity (http://ellislab.com) CodeIgniter MVC Implementation More like "Passive View Pattern"

Controller

View Model

http://short.ie/5o7eg4 CI application flow

Stolen from CI user guide App components

Front controller Helper Routing Plugin Security Scripts Controller View Model Caching Library

index. Routing

http://domain.com/index.php/controller/method/param

class Search extends Controller {

public function single($id) { // [...] } } Security

Filtering or blocking unsafe input Controller

load->library('session'); }

public methods are function index() { // mletters model is auto-loaded available as actions from $rows = $this->mletters->getMany(10); URL $data['rows'] = $this->_prepData($rows); $this->load->view('index', $data); } private methods prefixed function _prepData($rows) { with “_” // do some cleanup on the data… } ?> Model

ActiveRecord pattern available, not required Query binding

$sql = "SELECT * FROM some_table WHERE id = ? AND status = ? AND author = ?"; $this->db->query($sql, array(3, 'live', 'Rick'));

Don't like the DB layer? Use something else Zend_DB, Doctrine, DataMapper (http://bit.ly/ datamapper), IgniteRecord (http://bit.ly/igrec) … Library

A class designed to work on related tasks Helper

Procedural funcs, grouped by file Mostly for views; available in controllers

/** * Plural * * Takes a singular word and makes it plural * * @access public * @param string * @param bool * @return str */ function plural($str, $force = FALSE) { // [...] } Plugin

Single procedural function More extensive functionality than helper

$vals = array( 'word' => 'Random word', 'img_path' => './captcha/', 'img_url' => 'http://example.com/captcha/', 'font_path' => './system/fonts/texb.ttf', 'img_width' => '150', 'img_height' => 30, 'expiration' => 7200 );

$cap = create_captcha($vals); $cap['image']; Script

Other scripts the CI app might use View

Build response to client CI Views are limited Uses plain PHP as templating lang

  • Dear Zend,

    body?>

    Posted posted?>
    Liked by favorite_count?> person(s). I like this
    • View

    Optional template markup

    $this->load->library('parser'); $this->parser->parse('blog_template', $data); {blog_title}

    {blog_heading}

    {blog_entries}

    {title}

    {body}

    Want a heavier template lang? {/blog_entries} Use one. Caching

    Saves response to file Serves up file contents if cache not expired CI Basics

    http://www.flickr.com/photos/canoafurada/395304306/ CI File Layout

    front controller index.php points to system and application folders

    system application

    base classes & app-specific classes built-in functionality & functionality CI File Layout

    default layout CI File Layout

    custom layout only index.php is under document root The CI Object

    $this inside controllers The loader

    $this->load->{view|library|model|helper|etc}('name'); CI Out of the box The Welcome App

    Put CI on the server Load it in the browser Why does Welcome load? How URLs map Trace with Xdebug/MacGDBp Making a Population estimates DB

    Get our data from Numbrary: http://short.ie/w3f6h3 Make a new controller Change the default route Config DB settings Make a model Make a view Make fancier views http://www.flickr.com/photos/dunechaser/2429621774/ Make a web API Web API for pop. est. DB

    Let users query our DB via HTTP Return results on JSON or serialized PHP Questions? http://www.flickr.com/photos/deadhorse/508559841/ @funkatron/#cw09 [email protected]