Best practice to add my changes and keep the ability to install future updates

Hello List,


thank you very much for all of your efforts, creating and maintaining
this amazing software project.

I am new to Horde and its components. Setting it up was easier than
expected and things work just fine.

Now I would like to extend and change some functionality, but I am
lacking information about the best practices.
And that is why I am writing to you.

For example, I would like to change this function:

Horde_Auth::genRandomPassword()

found in php/Horde/Auth.php at line 316:

    /**
     * Generates a random, hopefully pronounceable, password. This can
be used
     * when resetting automatically a user's password.
     *
     * @return string A random password
     */
    public static function genRandomPassword()
    {
        /* Alternate consonant and vowel random chars with two random
numbers
         * at the end. This should produce a fairly pronounceable
password. */
        return substr(self::CONSONANTS, mt_rand(0,
strlen(self::CONSONANTS) - 1), 1) .
            substr(self::VOWELS, mt_rand(0, strlen(self::VOWELS) - 1), 1) .
            substr(self::CONSONANTS, mt_rand(0, strlen(self::CONSONANTS)
- 1), 1) .
            substr(self::VOWELS, mt_rand(0, strlen(self::VOWELS) - 1), 1) .
            substr(self::CONSONANTS, mt_rand(0, strlen(self::CONSONANTS)
- 1), 1) .
            substr(self::NUMBERS, mt_rand(0, strlen(self::NUMBERS) - 1),
1) .
            substr(self::NUMBERS, mt_rand(0, strlen(self::NUMBERS) - 1), 1);
    }




Of course I could simply change this function so it does exactly what I
want.
But as soon as I install an update, I assume, my changes might get undone.

Since this function does not contain a hook I am wondering, what's the
best practice to add my changes and keep the ability to install future
updates?


Thank you for your time and attention,

Hendrik
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