Permalink change and loss of social sharings

Hello,

I have recently changed my permalink from the default (/?=postid) type to /%category%/%postname%/ and lost my social sharing counts.

Here are two link I was inspired to resolve that problem.

https://encosia.com/preserving-social-sharing-counters-through-a-url-change

https://lutfitorla.com/keeping-sharethis-digg-digg-social-counts-after-a-wordpress-permalink-change

Here is the code I tried to adapt (I’m a more than a newbie in this…)
and it’s not working… I try to paste it at the beggining of the Flare coding…

If anyone had an idea of what is wrong…

Thank you !

$sharing_url = get_permalink();

$url_change_id =572;
$post_id = get_the_ID();

$sharing_url = get_permalink();

if ($post_id < $url_change_id) {
$url_id_postfix = "/?p=" . $post_id;

$sharing_url = str_replace("://karinshibata.com" . ('Categories'), "://karinshibata.com" . $url_id_postfix, $sharing_url);
}

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