JSON Export for WordPress content

<?php
/**
 * Plugin Name: JSON Export
 * Description: Exports blog posts as JSON, including title, date, cleaned content (no URLs, HTML tags, images, newlines, or tabs), and permalink URL. Now with category-specific exports.
 * Version: 0.7
 * Author: Doug Belshaw
 * Author URI: http://dougbelshaw.com
 */

add_action('admin_menu', 'json_export_menu');

function json_export_menu() {
    add_menu_page('JSON Export', 'JSON Export', 'manage_options', 'json-export', 'json_export_page');
}

function json_export_page() {
    // Fetch categories for the dropdown
    $categories = get_categories();
    echo '<div class="wrap"><h1>JSON Export</h1>';
    echo '<form action="" method="post">';
    // Button for exporting all posts
    echo '<input type="submit" name="export_posts_json" value="Export All Posts" class="button-primary"/><br/><br/>';
    // Dropdown for categories
    echo '<select name="category">';
    foreach ($categories as $category) {
        echo '<option value="' . $category->term_id . '">' . $category->name . '</option>';
    }
    echo '</select>';
    echo '<input type="submit" name="export_category_json" value="Export Category Posts" class="button-primary"/>';
    echo '</form></div>';
}

add_action('admin_init', 'json_export_posts_to_json');

function json_export_posts_to_json() {
    if (current_user_can('manage_options')) {
        if (isset($_POST['export_posts_json'])) {
            $args = array('posts_per_page' => -1, 'post_status' => 'publish');
            $filename = 'blog-json-all-' . date('Y-m-d') . '.json';
        } elseif (isset($_POST['export_category_json']) && !empty($_POST['category'])) {
            $category_id = intval($_POST['category']);
            $category = get_category($category_id);
            $args = array('posts_per_page' => -1, 'post_status' => 'publish', 'cat' => $category_id);
            $category_name = strtolower(str_replace(' ', '-', $category->name));
            $filename = 'blog-json-' . $category_name . '-' . date('Y-m-d') . '.json';
        } else {
            return;
        }

        $posts = get_posts($args);
        $posts_array = array_map(function ($post) {
            // Get content and clean it
            $content = apply_filters('the_content', $post->post_content);

            // Remove URLs
            $content_without_urls = preg_replace('/https?:\/\/[^\s"]+/', '', $content);

            // Strip HTML tags
            $clean_content = wp_strip_all_tags($content_without_urls);

            // Remove newlines, tabs, and extra spaces
            $clean_content = str_replace(array("\n", "\r", "\t"), ' ', $clean_content);
            $clean_content = preg_replace('/\s+/', ' ', $clean_content); // Reduce multiple spaces to a single space

            return array(
                'id'      => trim($post->ID),
                'title'   => get_the_title($post->ID),
                //'date'    => get_the_date('Y-m-d', $post->ID),
                'content' => trim($clean_content), // Trim any leftover leading/trailing spaces
                'url'     => get_permalink($post->ID),
            );
        }, $posts);

        header('Content-Disposition: attachment; filename=' . $filename);
        header('Content-Type: application/json');
        echo json_encode($posts_array);
        exit;
    }
}