In this tutorial I am going to show you how we can work with RESTful or REST webservice in Codeigniter framework.

You may also like the Working with RESTful services in Codeigniter – PUT example, Codeigniter GET example with REST service and Working with RESTful services in Codeigniter – DELETE example

Introduction

The most important concept in REST is resources, which are identified by global IDs — typically using URIs. Client applications use HTTP methods (GET/ POST/ PUT/ DELETE) to manipulate the resource or collection of resources. A RESTful Web service is implemented using HTTP and the principles of REST. Typically, a RESTful Web service should define the following aspects:

The base/root URI for the Web service such as http://<host>/<appcontext/contextpath>/<url pattern>/<resources>.
The MIME type of the response data supported, which are JSON/XML/TEXT/HTML etc.
The set of operations supported by the service. (for example, POST, GET, PUT or DELETE).

Methods

HTTP methods are mapped to CRUD (create, read, update and delete) actions for a resource. Although you can make slight modifications such as making the PUT method to create or update, the basic patterns are listed as follows.

HTTP GET: Get/List/Retrieve an individual resource or a collection of resources.
HTTP POST: Create a new resource or resources.
HTTP PUT: Update an existing resource or collection of resources.
HTTP DELETE: Delete a resource or collection of resources.

You may read the section on REST API for Codeigniter https://philsturgeon.uk/codeigniter/2009/06/03/REST-implementation-for-CodeIgniter/

Prerequisites

Please go through Setup RESTful service with Codeigniter

Example

Step 1. Create a MySQL table contact under database roytuts

USE `roytuts`;

/*Table structure for table `contact` */

DROP TABLE IF EXISTS `contact`;

CREATE TABLE `contact` (
  `contact_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `contact_name` varchar(30) COLLATE utf8_unicode_ci NOT NULL,
  `contact_address` varchar(150) COLLATE utf8_unicode_ci NOT NULL,
  `contact_phone` varchar(15) COLLATE utf8_unicode_ci NOT NULL,
  PRIMARY KEY (`contact_id`)
) ENGINE=InnoDB AUTO_INCREMENT=13 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

Step 2. Modify <root directory>/application/config/autoload.php file for auto-loading html, url, file, form and database

$autoload['helper'] = array('html', 'url', 'file', 'form');
$autoload['libraries'] = array('database');

Step 3. Modify also <root directory>/application/config/database.php

'hostname' => 'localhost',
'username' => 'root',
'password' => '',
'database' => 'roytuts',
'dbdriver' => 'mysqli',

Step 4. Create a controller file RestPostController.php under <project root>/application/controllers with the following source code

<?php

defined('BASEPATH') OR exit('No direct script access allowed');

require(APPPATH . '/libraries/REST_Controller.php');

/**
 * Description of RestPostController
 *
 * @author https://roytuts.com
 */
class RestPostController extends REST_Controller {

    function __construct() {
        parent::__construct();
        $this->load->model('ContactModel', 'cm');
    }

    function add_contact_post() {
        $contact_name = $this->post('contact_name');
        $contact_address = $this->post('contact_address');
        $contact_phone = $this->post('contact_phone');
        
        $result = $this->cm->add_contact($contact_name, $contact_address, $contact_phone);

        if ($result === FALSE) {
            $this->response(array('status' => 'failed'));
        } else {
            $this->response(array('status' => 'success'));
        }
    }

}
  • is an alias for $this->input->post() which is CodeIgniter’s method to access $_POST variables with XSS protection.

Step 5. Create a model file ContactModel.php under <project root>/application/models with the following source code

<?php

defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * Description of ContactModel
 *
 * @author https://roytuts.com
 */
class ContactModel extends CI_Model {

    private $contact = 'contact';

    function add_contact($contact_name, $contact_address, $contact_phone) {
        $data = array('contact_name' => $contact_name, 'contact_address' => $contact_address, 'contact_phone' => $contact_phone);
        $this->db->insert($this->contact, $data);
    }

}

Step 6. Modify file <project root>/application/config/routes.php file

$route['default_controller'] = 'restpostcontroller';

Step 7. Now run the application on apache http server.

Step 8. Use the REST Client in Firefox browser to test the REST service.

Method: POST

Headers: Add Custom Header as name = Content-Type, value=application/json

URL: http://localhost/ci_3_1_0/index.php/restpostcontroller/add_contact

Body: {“contact_name”:”S Roy”, “contact_address”:”https://roytuts.com”, “contact_phone”:”1234567890″}

$[‘rest_default_format’]=’json’ at <root directory>/application/config/rest.php

Output:

{
    "status": "success"
}

Step 9. Check the database table, you will see one new row has been added with below data

contact_id	contact_name	contact_address	      contact_phone
    15	           S Roy	https://roytuts.com	1234567890

Thanks for reading.

Tags:

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3 thoughts on “Working with RESTful services in Codeigniter – POST example

  1. Thank you so much! I’m just starting to work with APIs and this tutorial was really useful for me. Really well explained. Thanks again.

  2. I am getting error

    ( ! ) Fatal error: Class ‘REST_Controller’ not found in C:\wamp64\www\codeIgniter\application\controllers\RestPostController.php on line 14
    Call Stack
    # Time Memory Function Location
    1 0.0000 264744 {main}( ) …\index.php:0
    2 0.0000 338976 require_once( ‘C:\wamp64\www\codeIgniter\system\core\CodeIgniter.php’ ) …\index.php:315
    3 0.0326 1411288 require_once( ‘C:\wamp64\www\codeIgniter\application\controllers\RestPostController.php’ ) …\CodeIgniter.php:411
    A PHP Error was encountered
    Severity: Error

    Message: Class ‘REST_Controller’ not found

    Filename: controllers/RestPostController.php

    Line Number: 14

    Backtrace:

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