Limit user posts

// Create the settings page

function restrict_user_posts_settings_page() {

    add_options_page(

        'Restrict User Posts Settings',

        'Restrict User Posts',

        'manage_options',

        'restrict-user-posts-settings',

        'restrict_user_posts_settings_page_content'

    );

}

add_action('admin_menu', 'restrict_user_posts_settings_page');

// Display the settings page content

function restrict_user_posts_settings_page_content() {

    ?>

    <div class="wrap">

        <h1><?php echo esc_html(get_admin_page_title()); ?></h1>

        <form action="options.php" method="post">

            <?php

                settings_fields('restrict_user_posts_settings');

                do_settings_sections('restrict-user-posts-settings');

                submit_button();

            ?>

        </form>

    </div>

    <?php

}

// Register the settings and fields

function restrict_user_posts_settings_init() {

    register_setting('restrict_user_posts_settings', 'max_user_posts');

    add_settings_section(

        'restrict_user_posts_settings_section',

        'Settings',

        null,

        'restrict-user-posts-settings'

    );

    add_settings_field(

        'max_user_posts',

        'Max Number of Posts per User',

        'max_user_posts_field_callback',

        'restrict-user-posts-settings',

        'restrict_user_posts_settings_section'

    );

}

add_action('admin_init', 'restrict_user_posts_settings_init');

// Display the Max Number of Posts input field

function max_user_posts_field_callback() {

    $max_user_posts = get_option('max_user_posts', 1);

    echo '<input type="number" id="max_user_posts" name="max_user_posts" value="' . esc_attr($max_user_posts) . '" min="1" />';

}

// Restrict user posts based on the maximum number set in the settings page

function restrict_user_posts($post_id, $post) {

    if (wp_is_post_revision($post_id) || wp_is_post_autosave($post_id)) {

        return;

    }

    $post_type = get_post_type_object($post->post_type);

    if ($post_type->name != 'post') {

        return;

    }

    $user = wp_get_current_user();

    if ($user->ID == 1 || in_array('administrator', $user->roles)) {

        return;

    }

    $max_user_posts = get_option('max_user_posts', 1);

    $query = new WP_Query(array(

        'post_type' => 'post',

        'author' => $user->ID,

        'post_status' => array('publish', 'pending', 'draft', 'private'),

        'posts_per_page' => -1,

    ));

    if ($query->have_posts() && $query->post_count >= $max_user_posts) {

        wp_die('<center><h2>You can only have ' . $max_user_posts . ' post(s). Try editing your current post(s) instead.</h2><br /><img style="height:500px;" src="https://i.snipboard.io/kUyW2n.jpg" /></center>');

    }

    wp_reset_query();

}

add_action('save_post', 'restrict_user_posts', 10, 2);