Ci framework learning of PHP

One 、 Preface

       I didn't expect that the new company would use CI frame , Although I've always heard , But we still use laravel,yii,tp A little more , First contact CI, It's worth noting .

       About online CI There are many documents , Also very comprehensive , Bloggers here simply record . Those that need to be recorded in the future will continue to be supplemented ,, It's not a very friendly article for beginners ..

Two 、CI introduction

 Manual address ：http://codeigniter.org.cn/user_guide/

1、 see ci Version number of the frame

 Global search in the project ：CI_VERSION
define('CI_VERSION', '2.x');

2、 CI The frame sets the default controller

1. Get into application Of config Under the folder , find routes.php
2. See settings ：$route['default_controller'] = "test";  //  It means default access test Controller index Method 

3、 How to call the core class library （system/core/config.php）

(1) Call the core library in the controller 
$aa = $this->config->base_url();

（2） Call the logic file in the controller 
$this->load->biz('test/test1'); // test1.php Is the logical file name 

4、 Call of system class library （system/libraries/config.php）

$this->load->library('class_name'); // Call a single file 
$this->load->library(array('email', 'table')); // Call multiple files 
$this->class_name->error_array();  // At the end of the call , You can directly use the methods in the system class library 

5、 Call of auxiliary function class （system/helps/test.php）

$this->load->library('test');
$casUserInfo = $this->test->xxx(); //  After calling, you can directly use 

6、 Call of model class （system/models/model_name.php）

$this->load->model('blog/model_name');  The reference is located in the model under the subdirectory 
$this->model_name->method();  After loading , You can access the methods in the model through an object with the same name as your class .

7、 Render the page

$this->load->view($template, $data, TRUE);

8、 Other calls （redis）

// Need to be in config Folder new redis.php file , The configuration is written inside 
$this->load->redis('key Name '); //redis

9、 Get and set config Value

echo $this->config->item('charset'); // obtain config Configured in charset value 
$this->config->set_item('charset', 'gbk') // To reset config in charset Value 

10、 The above methods are all in controller In the call , If not controller What to do in ？

 To access from your custom class library CodeIgniter The original resources of , You have to use  get_instance()  function . This function returns one CodeIgniter super object.
$CI = &get_instance();
$CI->load->config('test1'); // load core Profile under , for example test1.php
$CI->load->model('xxx/test_db'); //   load model The files under the 
$CI->load->library('http');  // load  library The files under the 
$CI->load->redis('test');  //  call redis
$CI->load->rabbitmq('test'); //  call rabbitmq
$CI->load->view($template, $data, TRUE);  //  Render the page 

11、ci Command line call

Call mode ：php index.php controller Method Parameters
Example ：

*/1 * * * * php  Project directory /index.php test test_1 0 > /dev/null 2>&1

explain ：

（1） Command line mode similar to other frameworks , The front is php Location , Followed by the project root directory index,php
 (2)  The following ones are separated by spaces , Controller file name (application Inside ), Method name , Parameters 
（3） Method example ：
//  This is the corresponding method ,$index Is the parameter 
public function test_1($index = 0)
    {}

12、 Excellent introductory blog recommendation

https://www.cnblogs.com/lovele-/p/9434328.html
https://blog.csdn.net/qq_21806621/article/details/70992328
https://www.cnblogs.com/xiaoxiaoqingyi/p/6654190.html

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