Introduction to CodeIgniter Ed Finkler http://funkatron.com - - PowerPoint PPT Presentation

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Introduction to CodeIgniter Ed Finkler http://funkatron.com - - PowerPoint PPT Presentation

Mar 19, 2024 229 likes •601 views

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

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Introduction to CodeIgniter

Ed Finkler • http://funkatron.com • @funkatron codeworks09

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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

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Why CodeIgniter?

http://www.flickr.com/photos/alternatewords/2332580309/

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Why not CakePHP or Zend Framework or Limonade or Symfony or Solar or Kohana

  • r Zoop or Yii or Akelos or

PHP on Trax or Prado or Seagull?

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Because you've gotta pick one, dammit

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All of them have value

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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)

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CodeIgniter MVC Implementation

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More like "Passive View Pattern"

http://short.ie/5o7eg4 Controller Model View

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CI application flow

Stolen from CI user guide

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App components

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

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Front controller

index.php

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Routing

class Search extends Controller { public function single($id) { // [...] } } http://domain.com/index.php/controller/method/param

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Security

Filtering or blocking unsafe input

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Controller

The core of everything "Heavy": you could do everything in controller public methods are available as actions from URL private methods prefixed with “_”

<?php class Site extends Controller { function Site() { parent::Controller(); $this->load->library('session'); } function index() { // mletters model is auto-loaded $rows = $this->mletters->getMany(10); $data['rows'] = $this->_prepData($rows); $this->load->view('index', $data); } function _prepData($rows) { // do some cleanup on the data… } ?>

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Model

ActiveRecord pattern available, not required Query binding Don't like the DB layer? Use something else Zend_DB, Doctrine, DataMapper (http://bit.ly/ datamapper), IgniteRecord (http://bit.ly/igrec) …

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

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Library

A class designed to work on related tasks

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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) { // [...] }

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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); echo $cap['image'];

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Script

Other scripts the CI app might use

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View

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

<?php foreach ($rows as $row): ?> <li class="letter"> <div class="body"> <h3>Dear Zend,</h3> <p><?=$row->body?></p> </div> <div class="meta"> <div class="posted"> <a href="<?=site_url('/site/single/'.$row->id)?>">Posted <?=$row->posted?></a> </div> <div class="favorite">Liked by <?=$row->favorite_count?> person(s). <a href="<?=site_url('/site/favorite/'.$row->id)?>">I like this</a> </div> </div> </li> <?php endforeach ?>

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View

Optional template markup Want a heavier template lang? Use one.

<html> <head> <title>{blog_title}</title> </head> <body> <h3>{blog_heading}</h3> {blog_entries} <h5>{title}</h5> <p>{body}</p> {/blog_entries} </body> </html> $this->load->library('parser'); $this->parser->parse('blog_template', $data);

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Caching

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

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CI Basics

http://www.flickr.com/photos/canoafurada/395304306/

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CI File Layout

index.php system application

base classes & built-in functionality app-specific classes & functionality front controller points to system and application folders

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CI File Layout

default layout

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CI File Layout

custom layout

  • nly index.php is under

document root

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The CI Object

$this inside controllers

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The loader

$this->load->{view|library|model|helper|etc}('name');

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CI Out of the box

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The Welcome App

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

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Making a web application

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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

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Make a web API

http://www.flickr.com/photos/dunechaser/2429621774/

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Web API for pop. est. DB

Let users query our DB via HTTP Return results on JSON or serialized PHP

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Questions?

@funkatron/#cw09 coj@funkatron.com

http://www.flickr.com/photos/deadhorse/508559841/