20 Random Alphanumeric Passwords

The passwords:


u7ZvfoGRM8pKsJzco2qx
Qc8dwSRVRaGVspGWtxZK
rMSwkxfFapWoZaSMgCAB
eMAoYeJ49PyhgMu6rzBs
KrXQgcYu2nW64tszHeuj
tLJXVaehheKRzmSwR7v7
2Dq6mFQ9zZM8hL3rkLFq
JCY9RRmkS7puWgd28PbC
yufLQNARewwV88pQFQUg
WRWNTEJyEy3ptdNhXAgD
t6a9GyzxG7XH8gATcPyK
Nez7KmEaqjVUe9H9ngyM
t6sBGESFXvPTDXko7HG6
nqmjxrab3LF7Nbvs3fCa
BMNFB6ukKEpfdgvts7hS
a4CPQZqDsCB3NgforRbq
DbPFMcs6xnHSTMEGoALp
8DUTVq29mnrzWrwewLvJ
GgyuD37DW69GeER6EJkV
LL6KrHZpTjK8YHaAxP2o

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);