random string number generator in php codeigniter

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

class Random_string_generator extends CI_Controller {

    public function index()
    {
        $length = 8;
        $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
        $characters_length = strlen($characters);
        $random_string = '';
        for ($i = 0; $i < $length; $i++) {
            $random_string .= $characters[rand(0, $characters_length - 1)];
        }
        echo $random_string;
    }
}

1. Start by defining the class Random_string_generator that extends CI_Controller.
2. Create the index method within the class to generate the random string.
3. Set the desired length of the random string, in this case, it's 8 characters.
4. Define the characters that can be used in the random string, including numbers, lowercase letters, and uppercase letters.
5. Determine the length of the character set.
6. Initialize an empty string to hold the random string.
7. Use a for loop to iterate through the desired length and append a random character from the character set to the random string.
8. Output the generated random string.
9. Ensure that no direct script access is allowed by checking the constant BASEPATH.