// 假设你的插件设置键为 'my_plugin_settings'
$settings = get_option('my_plugin_settings', array('option1' => 'value1', 'option2' => 'value2'));

// 现在你可以使用 $settings 变量来访问插件设置
echo $settings['option1']; // 输出 'value1'

// 假设我们要更新插件设置
$new_settings = array(
    'option1' => 'new_value1',
    'option2' => 'new_value2'
);

// 使用 update_option() 函数更新设置
update_option('my_plugin_settings', $new_settings);

<?php
// 在插件文件中注册一个设置页面
function my_plugin_menu() {
    add_options_page('My Plugin Settings', 'My Plugin', 'manage_options', 'my-plugin-settings', 'my_plugin_settings_page');
}
add_action('admin_menu', 'my_plugin_menu');

// 插件设置页面内容
function my_plugin_settings_page() {
    ?>
    <div class="wrap">
        <h1>My Plugin Settings</h1>
        <form method="post" action="options.php">
            <?php
            // 使用 settings_fields() 和 do_settings_sections() 函数来处理表单提交和显示设置部分
            settings_fields('my_plugin_settings_group');
            do_settings_sections('my-plugin-settings');
            submit_button();
            ?>
        </form>
    </div>
    <?php
}

// 注册设置
function my_plugin_register_settings() {
    // 注册一个设置组
    register_setting('my_plugin_settings_group', 'my_plugin_settings');

    // 添加设置部分
    add_settings_section(
        'my_plugin_settings_section',
        'My Plugin Settings',
        'my_plugin_settings_section_callback',
        'my-plugin-settings'
    );

    // 添加设置字段
    add_settings_field(
        'my_plugin_option1',
        'Option 1',
        'my_plugin_option1_callback',
        'my-plugin-settings',
        'my_plugin_settings_section'
    );

    // 添加设置字段
    add_settings_field(
        'my_plugin_option2',
        'Option 2',
        'my_plugin_option2_callback',
        'my-plugin-settings',
        'my_plugin_settings_section'
    );
}
add_action('admin_init', 'my_plugin_register_settings');

// 设置部分回调函数
function my_plugin_settings_section_callback() {
    echo '<p>Enter your settings below:</p>';
}

// 设置字段回调函数
function my_plugin_option1_callback() {
    $settings = get_option('my_plugin_settings');
    ?>
    <input type="text" id="my_plugin_option1" name="my_plugin_settings[option1]" value="<?php echo esc_attr($settings['option1']); ?>" />
    <?php
}

// 设置字段回调函数
function my_plugin_option2_callback() {
    $settings = get_option('my_plugin_settings');
    ?>
    <input type="text" id="my_plugin_option2" name="my_plugin_settings[option2]" value="<?php echo esc_attr($settings['option2']); ?>" />
    <?php
}
?>