This PHP class allows you to generate safe passwords with a length between 16-20 characters. The passwords generated by this class will pass the Laravel `Rules/Password::default() check`, making them suitable for suggesting strong and secure passwords to users. To generate and return a password, simply call: `PasswordString::make()`.

PasswordString.php

<?php

namespace Base;

class PasswordString
{
    const LEGAL_CHARS = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*[]{}()_+-=,.<>?;:|';

    public static function make(): string
    {
        preg_match('/[a-z]+/', static::LEGAL_CHARS, $lowerCaseMatches);
        preg_match('/[A-Z]+/', static::LEGAL_CHARS, $upperCaseMatches);
        preg_match('/[0-9]+/', static::LEGAL_CHARS, $numberMatches);
        preg_match('/[!@#$%^&*]+/', static::LEGAL_CHARS, $specialMatches);

        $requiredChars = [
            self::getRandomCharFrom($upperCaseMatches[0]),
            self::getRandomCharFrom($lowerCaseMatches[0]),
            self::getRandomCharFrom($numberMatches[0]),
            self::getRandomCharFrom($specialMatches[0]),
            self::getRandomCharFrom(static::LEGAL_CHARS, rand(12, 16)),
        ];

        return str_shuffle(implode("", $requiredChars));
    }

    private static function getRandomCharFrom(string $string, int $quantity = 1): string
    {
        return substr(str_shuffle($string), 0, $quantity);
    }
}