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Codeigniter & PHP - forcing a 404?

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予麋鹿
予麋鹿 2020-12-08 10:19

In codeigniter, as you know, a page of the form: /class/function/ID, where class is the controller name, function is the method within the controller, and ID is

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  • 礼貌的吻别
    2020-12-08 10:52

    I had the same problem with you and I found a complete solution for this in CodeIgniter 3. Here I would like to share step by step how to solve it. Of course, we need to support a custom 404 page to satisfy SEO requirement.

    1. Show 404 page for URLs which do not match the schema in routes
      • Add a new Error controller in application/controllers to support a custom 404 page.
    class ErrorController extends CI_Controller 
{
    public function __construct() 
    {
        parent::__construct();
    } 

    public function index() 
    { 
        $this->output->set_status_header('404');
        return $this->load->view('errors/error_404'); 
    } 
}
    • Add a new custom view error_404.php for 404 page in application/views/errors
    <div>
    <p>We are so sorry. The page you requested could not be found.</p> 
</div>
    • Declare 404_overide in config/routes.php
    $route['404_override'] = 'ErrorController';
    1. Show 404 page for URLs which match the schema in routes but point to non-existing resource.
      • Set subclass_prefix in config/config.
    $config['subclass_prefix'] = 'MY_';
    • Define your custom Exceptions class in application/core
    class MY_Exceptions extends CI_Exceptions {

    public function __construct() {
        parent::__construct();
    }

    function show_404($page = '', $log_error = TRUE) {
        $CI = &get_instance();
        $CI->output->set_status_header('404');
        $CI->load->view('errors/error_404');
        echo $CI->output->get_output();
        exit;
    }

}
    • Call show_404() wherever you want. Here I created my custom supper model class in application/models and check query results there. Other models will extends the supper model and show 404 page if they could not found a resource.
    abstract class MY_Model extends CI_Model
{

    protected $table = 'table_name';

    public function __construct()
    {
        parent::__construct();
        $this->load->database();
    }

    public function find($id)
    {
        $result = $this->db->get_where($this->table, ['id' => $id]);
        $data = $result->row_object();

        if (!$data) {
            show_404();
        }

        return $data;
    }
}
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  • 挽巷
    2020-12-08 10:53

    show_404() actually sends the proper headers for a search engine to register it as a 404 page (it sends 404 status).

    Use a Firefox addon to check the headers received when calling show_404(). You will see it sends the proper HTTP Status Code.

    Check the default application/errors/error_404.php. The first line is:

    <?php header("HTTP/1.1 404 Not Found"); ?>

    That line sets the HTTP Status as 404. It's all you need for the search engine to read your page as a 404 page.

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  • 深忆病人
    2020-12-08 10:55

    Only follows these steps:

    Step 1 Update your application/config/routes.php file 

    $route['404_override'] = 'error/error_404';

    Step 2 Create your own controller in controllers folder ex. error.php

    <?php
class Error extends CI_Controller
{
function error_404()
{
    $data["heading"] = "404 Page Not Found";
    $data["message"] = "The page you requested was not found ";
        $this->load->view('error',$data);
}
}
?>

    Step 3 Create your view in views folder ex. error.php

    <html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252" />
<title><?php echo $heading;?></title>
</head>

<body>
<?php echo $message;?>
</body>
</html>
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  • 失恋的感觉
    2020-12-08 10:57

    Yes show_404() WILL send out a 404 but it looks like hell. There have been a few hacks suggested here, but why hack when you can use built in features?

    Upgrade to CI 2.0 and you'll be able to use the amazing:

    $route['404_override'] = 'errors/error_404';

    Then you can have a general errors controller without having to worry about trying to load views, libraries and helpers WY too early in the CI instance to function properly.

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  • 感动是毒
    2020-12-08 10:58 
            $this->output->set_status_header('404');

    to generate 404 headers.

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  • 一整个雨季
    2020-12-08 10:58

    Create controller in your application/controllers folder.

    class Error extends Controller
{
function error_404()
{
    $this->load->view('error');
}
}

    Then in your application/library extend the Router class by creating application/libraries/MY_Router.php

    class MY_Router extends CI_Router
{
private $error_controller = 'error';
private $error_method_404 = 'error_404';

function MY_Router()
{
    parent::CI_Router();
}

// this is just the same method as in Router.php, with show_404() replaced by $this->error_404();
function _validate_request($segments)
{
    // Does the requested controller exist in the root folder?
    if(file_exists(APPPATH.'controllers/'.$segments[0].EXT))
    {
        return $segments;
    }

    // Is the controller in a sub-folder?
    if(is_dir(APPPATH.'controllers/'.$segments[0]))
    {
        // Set the directory and remove it from the segment array
        $this->set_directory($segments[0]);
        $segments = array_slice($segments, 1);
        if(count($segments) > 0)
        {
            // Does the requested controller exist in the sub-folder?
            if(!file_exists(APPPATH.'controllers/'.$this->fetch_directory().$segments[0].EXT))
            {
                return $this->error_404();
            }
        }
        else
        {
            $this->set_class($this->default_controller);
            $this->set_method('index');
            // Does the default controller exist in the sub-folder?
            if(!file_exists(APPPATH.'controllers/'.$this->fetch_directory().$this->default_controller.EXT))
            {
                $this->directory = '';
                return array();
            }
        }
        return $segments;
    }
    // Can't find the requested controller...
    return $this->error_404();
}

function error_404()
{
    $segments = array();
    $segments[] = $this->error_controller;
    $segments[] = $this->error_method_404;
    return $segments;
}

function fetch_class()
{
    // if method doesn't exist in class, change
    // class to error and method to error_404
    $this->check_method();
    return $this->class;
}

function check_method()
{
    $class = $this->class;
    if (class_exists($class))
    {
        if ($class == 'doc')
        {
            return;
        }
        if (! in_array('_remap', array_map('strtolower', get_class_methods($class)))
            && ! in_array(strtolower($this->method), array_map('strtolower', get_class_methods($class))))
        {
            $this->class = $this->error_controller;
            $this->method = $this->error_method_404;
            include(APPPATH.'controllers/'.$this->fetch_directory().$this->error_controller.EXT);
        }
    }
}

    }

    If the page does not exist, it will be routed to error controller

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