Fix broken serialized data (drupal metatags, for example)

fix_unserialized.php

<?php
// based on https://stackoverflow.com/a/21389439/18216946

$unserialized = "a:2:{s:2:"aaaaaaaaaaaaa";}"; // some potentially broken data

$fixed_data = preg_replace_callback ( '!s:(\d+):"(.*?)";!', function($match) {      
    return ($match[1] == strlen($match[2])) ? $match[0] : 's:' . strlen($match[2]) . ':"' . $match[2] . '";';
},$unserialized );

$final = unserialize($fixed_data);