Password generator

example.php

<?php

$passworder = new Passworder(Passworder::LEVEL_GOD);
echo $passworder->new(64, 128);

Passworder.php

<?php 

class Passworder
{
    const CHARS = [
        '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
        '!#$%&()*+,-./:;<=>?[\]^_`{|}~',
        'àáãâäèéêëìíîïòóõôöúùûüñýÿÀÁÃÂÄÈÉÊËÌÍÎÏÒÓÕÔÖÚÙÛÜÑÝŸ',
        '§“”‘’‹›«»…¦•¶♠♣♥♦©®™£¢€¥¤æš',
    ];

    const MIN = 32;

    const MAX = 64;

    const LEVEL_BASIC = 0;

    const LEVEL_SUPER = 1;

    const LEVEL_POWER = 2;

    const LEVEL_GOD = 3;

    private $level;

    private $chars = null;

    public function __construct($level = null)
    {
        $this->level = $level;
        if ($this->level === null) {
            $this->level = self::LEVEL_BASIC;
        }

        $this->chars = self::CHARS[0];
        if ($this->level >= self::LEVEL_SUPER) {
            $this->chars .= self::CHARS[1];
        }
        if ($this->level >= self::LEVEL_POWER) {
            $this->chars .= self::CHARS[2];
        }
        if ($this->level >= self::LEVEL_GOD) {
            $this->chars .= self::CHARS[3];
        }
    }

    private function char()
    {
        $char = mb_substr($this->chars, rand(0, mb_strlen($this->chars) - 1), 1, 'UTF-8');
        return $char;
    }

    public function new($min = null, $max = null)
    {
        $min = !$min ? self::MIN : $min;
        $max = !$max ? self::MAX : $max;

        if ($max < $min) {
            $max = $min;
        }

        $length = rand($min, $max);
        $password = '';

        for ($i = 0; $i < $length; $i++) {
            $password .= $this->char();
        }

        return $password;
    }
}