php-src/sapi/fuzzer/generate_unserialize_dict.php

<?php

$dict = "";
foreach (get_declared_classes() as $class) {
    $len = strlen($class);
    $dict .= "\"$len:\\\"" . addslashes($class) . "\\\"\"\n";
}

file_put_contents(__DIR__ . "/dict/unserialize", $dict);