php - Check duplicate data in CodeIgniter try to make a callback function -

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i have registration form. here i'm able check duplicate email custom unique call function (don't try use is_unique). doesn't returns anything. here code.

controller - 

public function add_member () {      $this->load->library('form_validation');      $post_email = $this->input->post('email_id');     $this->form_validation->set_rules('email_id', 'email id/ username', 'required|trim|xss_clean|valid_email|callback_check_duplicate_email[' . $post_email . ']');     $this->form_validation->set_rules('password', 'your password', 'required|min_length[5]|max_length[12]|matches[confirm_password');     $this->form_validation->set_rules('confirm_password', 'password confirmation', 'required');      $this->form_validation->set_message('check_duplicate_email', 'this email exist. please write new email.');      if ($this->form_validation->run() == false) {         // validation failed          $this->load->view('member/reg_form');      } else {          $data['email_id'] = $post_email;         $data['password'] = md5($this->input->post('password'));          $insert = $this->model_member->insert_data_to_db($data);          if ($insert) {             $success = "wao ! added our community.";             $this->session->set_flashdata('message_success', $success);             $this->load->view('member/success_page');         } else {             $error = "hey email exists in our community.";             $this->session->set_flashdata('message_error', $error);             $this->load->view('member/reg_form');         }     }  }  // callback function public function check_duplicate_email($post_email) {      return $this->model_member->checkduplicateemail($post_email);  }

model - 

 //for checking email existance  public function checkduplicateemail($post_email) {      $this->db->where('email_id', $email_id);      $query = $this->db->get('my_registration_table');      $count_row = $query->num_rows();      if ($count_row > 0) {         return true;     } else {         return false;     } }  // insert data db public function insert_data_to_db($data) {     return $this->db->insert('my_registration_table', $data); }

when try submit form email exists. function doesn't stop me , doesn't show validation error message. here see what's problem? waiting help.

your problem in model function. @ following model function.

public function checkduplicateemail($post_email) {      $this->db->where('email_id', $email_id);      $query = $this->db->get('my_registration_table');      $count_row = $query->num_rows();      if ($count_row > 0) {       //if count row return row; means have email address in database. must set false in sense.         return false; // here change true false.      } else {       // doesn't return row means database doesn't have email         return true; // , here false true      } }

try this. hope works.


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