WordPress自定义程序图像输出在前端，不工作

我看到了“ 但是没有得到任何帮助

我的代码是

function sorcey_customize_register($wp_customize){

    $wp_customize->add_section('sorcey_footer', array(
      'title'    => __('Footer', 'sorcey'),
      'description' => '',
      'priority' => 120,
));

/*  =============================
  Footer logo
===============================*/
$wp_customize->add_setting('sorcey_footer_logo', array(
  'default'        => '',
  'capability'     => 'edit_theme_options',
  'type'           => 'text',
));
$wp_customize->add_control( new WP_Customize_Cropped_Image_Control( 
$wp_customize, 'sorcey_footer_logo_ctrl', array(
    'label'         => __( 'Footer Logo', 'sorcey' ),
    'section'       => 'sorcey_footer',
    'settings' => 'sorcey_footer_logo',
    'height'        => '40px',
    'width'         => '160px',
    'button_labels' => array(
        'select'       => __( 'Select logo' ),
        'change'       => __( 'Change logo' ),
        'remove'       => __( 'Remove' ),
        'default'      => __( 'Default' ),
        'placeholder'  => __( 'No logo selected' ),
        'frame_title'  => __( 'Select logo' ),
        'frame_button' => __( 'Choose logo' ),
    ),
    )
));
}

我试着用计算机输出

echo get_theme_mod( 'sorcey_footer_logo' );

及

及

---

但是显示“boolean false”

有人知道吗？有人知道吗？

echo wp_get_attachment_url( get_theme_mod( 'sorcey_footer_logo' ) );

var_dump(get_theme_mod( 'sorcey_footer_logo' ));