20 Random Alphanumeric Passwords

The passwords:


JWFvzXtKg9uZ8sCJKpkQ
tUQts7YVnrHmZxBSABNA
7aUvvhz8J7utq6KY4rJf
tHdxB4BffdcFp4E3tpH8
EcfARNWEMRd4oLSKRj8t
hz9mQtckC8wWpH26XBuy
sMUp4sYqRDGanAgpEv3c
rumvZDt8qWCrLTpURqau
ZvMjbHJaXfoAbm7rV6CX
A4Eep6xXpqGGKBM9KFmS
JPj4egZSdYYTTQbJnYuW
yZSba98uKw6jWsT3eScS
T3oJygCqm94XLaFTCPB9
HrVyPSytowsShoU3PRDx
TvSuBoPTmqBJKoMVPwhh
EzGcamp6aJt2VDN2eBKy
K3JP32vuXFyBVLrGNGfg
TEJAqnJNVVnW6Bmhw8XM
NDDvTRKnfMTCKhB4tQdc
aRBPpxdSKUEVYrK284Q2

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);