WordPress 플러그인에 온라인 채팅 기능을 추가하는 방법

function add_chat_button() {
    $api_key = 'YOUR_TAWKTO_API_KEY';
    echo '<script type="text/javascript">
                var Tawk_API=Tawk_API||{}, Tawk_LoadStart=new Date();
                (function(){
                    var s1=document.createElement("script"),s0=document.getElementsByTagName("script")[0];
                    s1.async=true;
                    s1.src="https://embed.tawk.to/" + $api_key + "/default";
                    s1.charset="UTF-8";
                    s1.setAttribute("crossorigin","*");
                    s0.parentNode.insertBefore(s1,s0);
                })();
            </script>';
}
add_action('wp_footer', 'add_chat_button');

function chat_settings_init() {
    add_settings_section('chat_settings_section', __('Chat Settings', 'wp_chat'), false, 'general');

    add_settings_field(
        'tawkto_api_key',
        __('Tawk.to API Key', 'wp_chat'),
        'chat_settings_callback',
        'general',
        'chat_settings_section'
    );

    register_setting('general', 'tawkto_api_key');
}
add_action('admin_init', 'chat_settings_init');

function chat_settings_callback() {
    $api_key = get_option('tawkto_api_key');
    echo '<input type="text" id="tawkto_api_key" name="tawkto_api_key" value="' . $api_key . '" />';
}

function chat_settings_page() {
    ?>
    <div class="wrap">
        <h1><?php echo esc_html(get_admin_page_title()); ?></h1>
        <form method="post" action="options.php">
            <?php
            settings_fields('general');
            do_settings_sections('general');
            submit_button();
            ?>
        </form>
    </div>
    <?php
}
function add_chat_settings_submenu() {
    add_submenu_page('options-general.php', __('Chat Settings', 'wp_chat'), __('Chat Settings', 'wp_chat'), 'manage_options', 'chat-settings', 'chat_settings_page');
}
add_action('admin_menu', 'add_chat_settings_submenu');