CodeIgniter post_controller_constructor Hook运行两次？

Question

I have this code in application\config\hooks.php

$hook['post_controller_constructor'] = array(
'class' => 'maintenance',
'function' => 'maintenance',
'filename' => 'maintenance.php',
'filepath' => 'hooks',
'params' => array()
);

and this code in application\hooks\maintenance.php

class maintenance
{
   var $CI;    
   public function maintenance()
   {
    echo "Test";
   }
}

and this code in application\config\config_maintenance.php

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

$config['maintenance'] = true;

and here's how my controller looks like:

<?php
 class Home extends CI_Controller {
function __construct()
{
    parent::__construct();
    $this->load->model(array('home_model'));

}

function index()
{
    $this->load->view('home');
}
}

When the code is run, "Test" is echoed twice on the page if I don't add "exit;" after the echo statement. Does that means that "post_controller_constructor" is being called twice?

I am wondering why is this because as per CI documentation

post_controller_constructor: Called immediately after your controller is instantiated, but prior to any method calls happening.

Answer 1

Okay, the problem lies in your Maintenance class and in your hook definition. You call the hook maintenance and the function maintenance. If you name a method the same way as the class, then this method is the class constructor. Go ahead and rename your method:

hooks.php

$hook['post_controller_constructor'] = array(
    'class' => 'maintenance',
    'function' => 'differentName',
    'filename' => 'maintenance.php',
    'filepath' => 'hooks',
    'params' => array()
);

maintenance.php

class maintenance
{
   var $CI;    
   public function differentName()
   {
      echo "Test";
   }
}