20 Random Alphanumeric Passwords

The passwords:


EdCnKwwC74AzDz9KDtaQ
gGAQwYmLNqjaok9bsVYE
guzZhttPs6ozYuqo7DGT
h6EnrTZ84zgDsPwXVXFV
9C2GUyLz48YGhTcmt9cX
SBZWJk9sutLheQwo42uv
gGYCAEUTGEdCyTPhgeHp
YELexjJrxbEgVzGukZHc
KAvjxf3s3TSWX3wFEGE9
42RASA978LwzP8KtLEvQ
Q6VVNYUZmPRSvobAk7wr
j69XuWGJo6LwJdCKScTh
7y4dbBTaKkaWhF9vmCGE
3JxcrmCkVamh2MbBP84A
RfWhoZMfJLDYoRSWHqHH
N4hevTFnS9MuMUn4c3Sx
P48C3NVjzeMdmvG8h42y
uhrndErvjX9MuCGsQvrc
8b2gdULk6gvof8cZwKZq
ALgJBkCx6aHgq9ACmSYG

The code for the class

<?php

/**
 * Class PasswordGenerator
 */
class PasswordGenerator
{

    public static $letters = "2346789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghjkmnopqrstuvwxyz";
    public static $length = "20";
    public $letters_array;

    function __construct()
    {
        $this->letters_array = array();

        for ($a = 0; $a < strlen(self::$letters); $a++) {
            $this->letters_array[] = self::$letters[$a];
        }
    }


    function make(): string
    {
        $password = '';
        for ($i = 0; $i < self::$length; $i++) {
            srand((float)microtime() * 10000000);
            $password .= $this->letters_array[array_rand($this->letters_array)];
        }
        return $password;

    }

    function printOne()
    {
        print $this->make();
    }

    function printMany($num)
    {
        for ($i = 0; $i < $num; $i++) {
            $this->printOne();
            print "\n";
        }
    }


}

How to invoke the class

$PG = new PasswordGenerator();
$PG->printMany(20);