<?php

    $categories = explode(", ", $_GET['categories']);
    $tags = explode(", ", $_GET['tags']);
    $months = explode(", ", $_GET['months']);

    echo '<h2>Categories</h2><ul>';
    foreach ($categories as $category) {
        echo '<li>' . $category . '</li>';
    }
    echo '</ul>';

    echo '<h2>Tags</h2><ul>';
    foreach ($tags as $tag) {
        echo '<li>' . $tag . '</li>';
    }
    echo '</ul>';

    echo '<h2>Months</h2><ul>';
    foreach ($months as $month) {
        echo '<li>' . $month . '</li>';
    }
    echo '</ul>';