CodeIgniter中REST API的GET/POST实现及报错解决求助

Hey there! Let's tackle your issues one by one—first fixing the immediate syntax error, then cleaning up other bugs, and finally walking through proper GET/POST implementation in CodeIgniter's REST API.

1. First: Fix the Syntax Error (ParseError) #

The error you're seeing (unexpected '->' (T_OBJECT_OPERATOR), expecting ')') comes from line 15 of your Example_api.php controller. You can't pass $this->get('id') directly as a method parameter in PHP—method parameters need to be variable names, not dynamic expressions.

Corrected Controller Code #

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

class Example_api extends REST_Controller { // Critical fix: Extend REST_Controller, not CI_Controller!
    public function __construct(){
        parent::__construct();
        $this->load->model('user_model');
    }

    // Fixed: Use a variable to fetch the ID inside the method
    function user_get() {
        $id = $this->get('id');
        
        if(!$id) {
            $this->response(NULL, 400); // Bad request if no ID is provided
        }

        $user = $this->user_model->get_user($id);
        
        if($user) {
            $this->response($user, 200); // Success response
        } else {
            $this->response(NULL, 404); // User not found
        }
    }

    function users_get() {
        $users = $this->user_model->get_all();
        
        if($users) {
            $this->response($users, 200);
        } else {
            $this->response(NULL, 404);
        }
    }
}

2. Fix the Model Bug #

There are two small issues in your User_model:

• A typo in get_all() (you used $query but defined the variable as $q)
• get_where() expects an associative array for the condition, not a raw ID value

Corrected Model Code #

<?php
class User_model extends CI_Model{
    function __construct(){
        parent::__construct();
    }

    public function get_user($id){
        // Fixed: Pass an associative array to target the 'id' column
        $q = $this->db->get_where("employee", ['id' => $id]);
        return $q->result_array();
    }

    public function get_all(){
        $q = $this->db->get("employee");
        return $q->result_array(); // Fixed: Use $q instead of undefined $query
    }
}

3. How GET Requests Work (Now Fixed!) #

Your GET endpoints are ready to use:

• GET /example_api/user?id=1: Fetches a single user by ID (returns 400 if no ID is provided, 404 if the user doesn't exist)
• GET /example_api/users: Fetches all users from the employee table

4. Implementing POST Requests #

To add a POST endpoint (e.g., create a new user), add this method to your Example_api controller:

function user_post() {
    // Grab POST data from the request
    $data = [
        'name' => $this->post('name'),
        'email' => $this->post('email'),
        // Add other columns from your 'employee' table here
    ];

    // Validate required fields
    if(!$data['name'] || !$data['email']) {
        $this->response(['error' => 'Name and email are required fields'], 400);
    }

    // Insert the new user into the database
    if($this->user_model->create_user($data)) {
        // Fetch the newly created user to return in the response
        $new_user = $this->db->get_where('employee', ['email' => $data['email']])->row_array();
        $this->response($new_user, 201); // 201 = "Created" HTTP status code
    } else {
        $this->response(['error' => 'Failed to create user'], 500);
    }
}

Then add this method to your User_model:

public function create_user($data){
    return $this->db->insert('employee', $data);
}

Test this in Postman by sending a POST request to /example_api/user with a JSON or form-data body containing name and email.

5. Testing with Postman #

After applying all fixes:

• For GET /example_api/users: You'll get a 200 response with all users (or 404 if the table is empty)
• For GET /example_api/user?id=1: You'll get the user's data (or 404 if no user matches the ID)
• For POST /example_api/user: You'll get a 201 response with the new user's data if the request is valid

内容的提问来源于stack exchange，提问作者Tanwir Alam