Unserialize Data (WordPress)

unserialize.php

<?php
// Your serialized data
$option_value = 'a:100:[...]';

$data = unserialize($option_value);

// Data to replace directly within variable
$data['footer_text'] = '<a href="https://www.lrob.fr">Webmaster lrob.fr</a>';

// We serilize data back
$new_option_value = serialize($data);

// And output for later use (phpMyAdmin or else)
echo "new serialized data: " . $new_option_value . "\n";