In this example we are going to show you how to how to export record in excel or CSV file using CodeIgniter framework PHP.
Here we using 3 files for import data in CodeIgniter framework MySQL PHP:
<?php
class Crud extends CI_Controller 
{
	public function __construct()
	{
		parent::__construct();/* call CodeIgniter's default Constructor */
		$this->load->database();/* load database libray manually */
		$this->load->model('Crud_model');/* load Model */
	}
	public function index(){
		$data['usersData'] = $this->Crud_model->getUserDetails();
		$this->load->view('users_view',$data); 
	}
	public function export_csv(){ 
		/* file name */
		$filename = 'users_'.date('Ymd').'.csv'; 
		header("Content-Description: File Transfer"); 
		header("Content-Disposition: attachment; filename=$filename"); 
		header("Content-Type: application/csv; ");
	   /* get data */
		$usersData = $this->Crud_model->getUserDetails();
		/* file creation */
		$file = fopen('php:/* output','w'); */
		$header = array("Username","Name","Gender","Email"); 
		fputcsv($file, $header);
		foreach ($usersData as $key=>$line){ 
			fputcsv($file,$line); 
		}
		fclose($file); 
		exit; 
	}
}
<?php
class Crud_model extends CI_Model 
{
	function getUserDetails(){
 		$response = array();
		$this->db->select('username,name,gender,email');
		$q = $this->db->get('users');
		$response = $q->result_array();
	 	return $response;
	}
	
}
<!DOCTYPE html>
<html lang="en">
 <head> 
   <meta charset="utf-8"> 
   <title> CodeIgniter EXPORT</title>
 </head>
 <body>
   <!-- Export Data --> 
   <a href='<?= base_url() ?>crud/export_csv'>Export</a><br><br>
   <!-- User Records --> 
   <table border='1' style='border-collapse: collapse;'> 
     <thead> 
      <tr> 
       <th>Username</th> 
       <th>Name</th> 
       <th>Gender</th> 
       <th>Email</th> 
      </tr> 
     </thead> 
     <tbody> 
     <?php
     foreach($usersData as $key=>$val){ 
       echo "<tr>"; 
       echo "<td>".$val['username']."</td>"; 
       echo "<td>".$val['name']."</td>"; 
       echo "<td>".$val['gender']."</td>"; 
       echo "<td>".$val['email']."</td>"; 
       echo "</tr>"; 
      } 
      ?> 
     </tbody> 
    </table>
  </body>
</html>
Run the program on your browser with URL:
http://localhost/codeIgniter/index.php/Crud
Here codeIgniter is my folder name. Put your folder name instead of codeIgniter.Rest of things are same.