Steps PHPSpreadsheet library

Here I will tell you how to import Excel File and display its content in webpage in Php Codeigniter framework using PhpSpreadsheet Library.
In this sample I will run my files in localhost using XAMPP
Steps to be performed are as following:
Step 1 - Install XAMPP
Step 2 - Place CodeIgniter folder inside C://XAMPP/htdocs/your_codeigniter_folder
Step 3 - Install Composer from this link -> "https://getcomposer.org/download/"
Step 4 - Now, Go to C://XAMPP/htdocs/your_codeigniter_folder/application/config/config.php and set
         $config['base_url'] = 'http://localhost/excel';                                    //'excel' is my codeigniter folder name
Step 5 - Next, Go to C://XAMPP/htdocs/your_codeigniter_folder/application/config/database.php and set
         $db['default']['hostname'] = 'localhost';                                          //'localhost' is my local machine
         $db['default']['username'] = 'root';                                               //'root' is my default mysql username
         $db['default']['password'] = 'root';                                               //'root' is my default mysql password
         $db['default']['database'] = 'excel';                                              //'excel' is my database name
Step 6 - Create your database in mysql and table inside it
         //my database name is 'excel' and table is 'कर_एवं_करेत्तर_राजस्व_संग्रह'
Step 7 - download '1.12.4jquery.min.js' and 'jquery-ui.js' javascript files and place it inside C://XAMPP/htdocs/your_codeigniter_folder/assets/js
Step 8 - Run your project in any browser. :)

If needed then you can view files uploaded by names 'readfile_controller.php' and 'readfile_view.php'.
For using 'readfile_controller.php' rename it to 'readfile.php' and place inside C://XAMPP/htdocs/your_codeigniter_folder/application/controllers 
For using 'readfile_view.php' rename it to 'readfile.php' and place inside C://XAMPP/htdocs/your_codeigniter_folder/application/views