20 Random Alphanumeric Passwords

The passwords:


axSj24Y9UKPBP3rkXFtp
neNYHoGNHpezQhgVQrv3
khabSbFnaSURbWmxm6Ha
rWhJXpRUmyHGpfbyyrqv
uTDbCL2vNALLmC69Aacm
X29qLZvu7eJshLqMJE6A
rDb2nTZustMhfcdeAdZc
ksNpwwbQKsKjwfzoYpZJ
t8yorTKDTDMykmvYLREC
DNaMe3ZgKMwP7wj4k8Xs
YDHvFpdYdVXWB2H9wvQg
BTn6xS8Q2nCVGLAmWkj7
YwhUTEYYVyxwaLrTd2Ve
XYMhkFnKrQrR4AMg9Fp2
MxgjnFuMB6wtrBgPDxjc
RuL8Ud3fXo77CNnbpexf
3TrrYjSvmLfuGRjQvMpA
4CEzsgRXE2ZJCB8L4Asq
EPnK6Lcs7ThYwxFVRhNY
LZLzKeKPTxtG9oyDjRe3

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);