Plugin-Settings: Admin Notice nach Speichern einfügen

<?php
add_action( 'admin_menu', 'test_add_admin_menu' );
add_action( 'admin_init', 'test_settings_init' );




function test_add_admin_menu(  ) { 


    add_menu_page( 'Test', 'Test', 'manage_options', 'test', 'test_options_page' );


}




function test_settings_init(  ) { 


    register_setting( 'pluginPage', 'test_settings' );


    add_settings_section(
        'test_pluginPage_section', 
        __( 'Your section description', 'wordpress' ), 
        'test_settings_section_callback', 
        'pluginPage'
    );


    add_settings_field( 
        'test_text_field_0', 
        __( 'Settings field description', 'wordpress' ), 
        'test_text_field_0_render', 
        'pluginPage', 
        'test_pluginPage_section' 
    );


    add_settings_field( 
        'test_checkbox_field_1', 
        __( 'Settings field description', 'wordpress' ), 
        'test_checkbox_field_1_render', 
        'pluginPage', 
        'test_pluginPage_section' 
    );




}




function test_text_field_0_render(  ) { 


    $options = get_option( 'test_settings' );
    ?>
    <input type='text' name='test_settings[test_text_field_0]' value='<?php echo $options['test_text_field_0']; ?>'>
    <?php


}




function test_checkbox_field_1_render(  ) { 


    $options = get_option( 'test_settings' );
    ?>
    <input type='checkbox' name='test_settings[test_checkbox_field_1]' <?php checked( $options['test_checkbox_field_1'], 1 ); ?> value='1'>
    <?php


}




function test_settings_section_callback(  ) { 


    echo __( 'This section description', 'wordpress' );


}




function test_options_page(  ) { 


    ?>
    <form action='options.php' method='post'>


        <h2>Test</h2>


        <?php
        settings_fields( 'pluginPage' );
        do_settings_sections( 'pluginPage' );
        submit_button();
        ?>


    </form>
    <?php


}


?>