lazy load models and libraries in CI 3 __get magic method of controller

问题

I am attempting to write a lazy loader for models + libraries in CI 3.0.4

I am trying to get the following as described in:

Model/library lazy load in CodeIgniter

This code seems to be for CI version 2 and when I tried to apply it to CI version 3.0.4 I get the following errors.

Severity: Notice

Message: Indirect modification of overloaded property Items::$benchmark has no effect

Filename: core/Controller.php

Line Number: 75


Fatal error: Cannot assign by reference to overloaded object in /Applications/MAMP/htdocs/phppos/PHP-Point-Of-Sale/system/core/Controller.php on line 75

Here is what I did:

Create file application/core/MY_Controller.php

Create the following code:

    //Lazy load based on https://stackoverflow.com/questions/17579449/model-library-lazy-load-in-codeigniter
    function __get($name)
    {
       if (isset($this->$name) && $this->$name instanceof CI_Model) 
        {
              return $this->$name;
        }
    }
  }

Once I can get this to work without errors; I will add my custom logic to load the right model or library.

I want to do this WITHOUT modifying core.

回答1:

Based on example I have come up with the following that does NOT require core modifications and works in CI 3.0.4. It first tries to load a model and if the model does NOT exist it attempts to load a library.

Create file application/core/MY_Controller.php

Put these contents in it.

<?php
class MY_Controller extends CI_Controller 
{

    //Lazy loading based on http://stackoverflow.com/questions/17579449/model-library-lazy-load-in-codeigniter
    public function __construct()
    {
        foreach (is_loaded() as $var => $class)
        {
             $this->$var = '';
        }

        $this->load = '';
        parent::__construct();
    }


    // Lazy load models + libraries....If we can't load a model that we have; then we will try to load library $name
    public function __get($name)
    {
        //Cache models so we only scan model dir once

        static $models = FALSE;
        $this->load->helper('file');

        if (!$models)
        {
            $model_files = get_filenames(APPPATH.'models', TRUE);
            foreach($model_files as $model_file)
            {
                $model_relative_name = str_replace('.php','',substr($model_file,strlen(APPPATH.'models'.DIRECTORY_SEPARATOR)));
                $model_folder = strpos($model_relative_name, DIRECTORY_SEPARATOR) !== FALSE ? substr($model_relative_name,0,strrpos($model_relative_name,DIRECTORY_SEPARATOR)) : '';
                $model_name = str_replace($model_folder.DIRECTORY_SEPARATOR, '',$model_relative_name);

                $models[$model_name] = $model_folder.'/'.$model_name;
            }
        }

        if (isset($models[$name]))
        {
            $this->load->model($models[$name]);
            return $this->$name;
        }
        else //Try a library if we cannot load a model
        {
            $this->load->library($name);
            return $this->$name;
        }

        return NULL;
    }
}

来源：https://stackoverflow.com/questions/35281870/lazy-load-models-and-libraries-in-ci-3-get-magic-method-of-controller

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