<?php
if (isset($_GET['categories']) && isset($_GET['tags']) && isset($_GET['months'])) {
    $categoryInput = htmlspecialchars($_GET['categories']);
    $categories = explode(', ', $categoryInput);
    $tagsInput = htmlspecialchars($_GET['tags']);
    $tags = explode(', ', $tagsInput);
    $monthsInput = htmlspecialchars($_GET['months']);
    $months = explode(', ', $monthsInput);

    echo "<h2>Categories</h2>";
    echo "<ul>";
    foreach ($categories as $category) {
        echo "<li>$category</li>";
    }
    echo "</ul>";
    echo "<h2>Tags</h2>";
    echo "<ul>";
    foreach ($tags as $tag) {
        echo "<li>$tag</li>";
    }
    echo "</ul>";
    echo "<h2>Months</h2>";
    echo "<ul>";
    foreach ($months as $month) {
        echo "<li>$month</li>";
    }
    echo "</ul>";
}