CI framework common classic operation Class Summary (routing, pseudo-static, paging, session, verification code, etc.) _ php instance

This article mainly introduces common Classic operations of the CI framework, and summarizes and analyzes the operations and usage skills of the CI framework, such as URL, route, pseudo-static, paging, session, and verification code, for more information, see the examples in this article. We will share this with you for your reference. The details are as follows:

1. URI in the Super object

Information about the resolution url of the CI_URI class

You can directly use $ this-> uri to use its related attributes.

System/core/URI. php file

Some common attributes:

(1) obtain url-related information in segments

$ This-> uri-> segment (4); // obtain the value of the fourth segment of pathinfo // in the url

Entry file. php/controller/action/parameter 1/parameter 2 /...

(2) passing parameters through the form parameters in the method

Pay attention to the default value and sequence.

Index. php/user/index/3/zhangsan

public function index($id=0,$name=''){  echo $id,$name;}

2. expansion of CI controller

Under the application/core/folder

Add your own extended controller

class MY_Controller extends CI_Controller{  public function __construct(){   parent::__construct  }}

Configure model prefix

$ Config ['subclass _ prefix'] = 'My _ '; // default value

3. model-related operations

All file names are in lowercase, and the first letter of the class name is in uppercase.

Suggested class name with _ model suffix

Load the model in the controller:

Add the following to construct:

$this->load->model('User_model');$this->User_model->get();

Alias for model

$this->load->model('User_model','user');$this->user->get();

4. common functions in URLs

(1) help us generate controllers

$ This-> load-> helper ('URL'); site_url ('Controller/method ');

(2) image path usage

$this->load->helper('url');

upload/a.jpg" />

You can configure automatic loading in autoload. php.

$ Autoload ['helper '] Add url

5. routing and pseudo-static in CI

(1) pseudo-static routing

$router['show/([\d]+)\.html']='article/show/$1';article/show/5.html => article/show/5;

(2) hide the entry file

# Enable the rewrite module of apache # put the. htaccess file in the root directory to rewrite RewriteEngine onRewriteCond % {REQUEST_FILENAME }! -DRewriteCond % {REQUEST_FILENAME }! -FRewriteRule ^ (. *) $ index. php/$1 [QSA, PT, L]

6. paging in CI

// Operate in the model // load the paging class file $ this-> load-> library ('pagination'); $ this-> load-> helper (url ); // pagination link $ config ['base _ url'] = site_url ('user/test'); // The total number of records $ config ['total _ rows '] = 100; // 10 pieces of data are displayed on each page. $ config ['per _ page'] = 10; // offset $ offset_limit = intval ($ this-> uri-> segment (3); $ this-> pagination-> initialize ($ config ); echo $ this-> pagination-> create_links ();

Button customization in the page (note that it is configured before initialization)

$ Config ['first _ link'] = 'homepage ';... $ config ['uri _ segment'] = 3; // the offset of querying paging data

Which segment of the url corresponds to the above $ offset

The default value is 3. Otherwise, the corresponding value needs to be modified.

7. Use of sessions in CI

// Load the session library $ this-> load-> library ('session ');

(1) obtain the system session

// For example, obtain the client ip address $ this-> session-> userdata ('IP _ address ');

(2) add a custom session

// Add $ this-> session-> set_userdata ('Some _ name', 'Some _ value '); // Get $ this-> session-> userdata ('Some _ name'); // delete $ this-> session-> unset_userdata ('Some _ name ');

(3) flashing data (invalid once Retrieved)

// Add $ this-> session-> set_flashdata ('item', 'value'); // Obtain $ this-> session-> flashdata ('ITEM ');

In the login data, the url of the page before logon can be recorded,

Note: One-time data is automatically destroyed once read.

To ensure security, add the random encryption string generated in config. php

$config['encryption_key']="fjkdsffjkhjd#kjh";

Whether to encrypt cookies

$config['sess_encrypt_cookie'] =TRUE;

8. file upload in CI

Upload processing:

$config['upload_path']="./upload";$config['allowed_types']='gif|jpeg|jpg';$this->load->library('upload',$config);$this->upload->do_upload('pic');

File upload data

$filedata = $this->upload->data();

9. the verification code in CI

// Generate the verification code $ this-> load-> helper ('captcha '); $ this-> load-> helper ('URL '); $ vals = array ('word' => rand (1000,9999), 'IMG _ path' => '. /captcha/', 'IMG _ url' => base_url (). '/captcha/''img _ width' => '000000', 'IMG _ height' => '000000', 'expiration' => 150 ); $ cap = create_captcha ($ vals); echo $ cap ['image']; // put the number obtained by the verification code in the session session_start (); $ _ SESSION ['Cap '] = $ cap ['word'];