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You should never store the original password in the database – a good security precaution.

Return a string of random text of a desired length

 

<?php

// return a string of random text of a desired length

function random_text($count, $rm_similar = false) {

    // create list of characters

    $chars = array_flip(array_merge(range(0, 9), range('A', 'Z')));

    // remove similar looking characters that might cause confusion

    if ($rm_similar) {

        unset($chars[0], $chars[1], $chars[2], $chars[5], $chars[8],

            $chars['B'], $chars['I'], $chars['O'], $chars['Q'],

            $chars['S'], $chars['U'], $chars['V'], $chars['Z']);

    }

    // generate the string of random text

    for ($i = 0, $text = ''; $i < $count; $i++) {

        $text .= array_rand($chars);

    }

    return $text;

}