我有一个扩展Visual Composer插件的主题，在首页上有一个滑块。滑块将显示来自五个不同客户的五份推荐信。我想在滑块中添加每个推荐信的特色图像作为缩略图。

以下是父主题的简短代码：

function jo_customers_testimonials_slider( $atts ) {
    extract( shortcode_atts( array( \'limit\' => 5, "widget_title" => __(\'What Are People Saying\', \'jo\'), \'text_color\' => "#000" ), $atts ) );
    $content = "";
    $loopArgs = array( "post_type" => "customers", "posts_per_page" => $limit, \'ignore_sticky_posts\' => 1 );

    $postsLoop = new WP_Query( $loopArgs );
    $content = "";

    $content .= \'...\';
    $content .= \'...\';
    $content .= \'...\';

    wp_reset_query();
    return $content;
}
add_shortcode( \'jo_customers_testimonials_slider\', \'jo_customers_testimonials_slider\' ); 

我的职能。php文件：

function jo_customers_testimonials_slider_with_thumbnail( $atts ) {
    extract( shortcode_atts( array( \'limit\' => 5, "widget_title" => __(\'What Are People Saying\', \'jo\'), \'text_color\' => "#000" ), $atts ) );
    $content = "";
    $loopArgs = array( "post_type" => "customers", "posts_per_page" => $limit, \'ignore_sticky_posts\' => 1 );

    $postsLoop = new WP_Query( $loopArgs );
    $content = "";

    $content .= \'...\';
    $content .= get_the_post_thumbnail( get_the_ID(), \'thumbnail\' );
    $content .= \'...\';
    $content .= \'...\';

    wp_reset_query();
    return $content;
}
add_shortcode( \'jo_customers_testimonials_slider\', \'jo_customers_testimonials_slider_with_thumbnail\' );

理论上，函数来自于我的函数。php文件应该覆盖父主题中的短代码。但当我使用此代码时，似乎什么都没有发生。我做错了什么？

Edit:
尝试了此代码，但仍然无法工作。

function wpa_add_child_shortcodes(){
remove_shortcode(\'jo_customers_testimonials_slider\');
    add_shortcode( \'jo_customers_testimonials_slider\', \'jo_customers_testimonials_slider_with_thumbnail\' );
}
add_action( \'after_setup_theme\', \'wpa_add_child_shortcodes\' );

也已更改
add_action( \'after_setup_theme\', \'wpa_add_child_shortcodes\' ); 至
add_action( \'init\', \'wpa_add_child_shortcodes\' );
，但结果无差异。

Edit 2 (With Solution):

正在更改add_action( \'after_setup_theme\', \'wpa_add_child_shortcodes\' ); 到add_action( \'wp_loaded\', \'wpa_add_child_shortcodes\' ); 解决了它。

function wpa_add_child_shortcodes(){
    add_shortcode( \'jo_customers_testimonials_slider\', \'jo_customers_testimonials_slider_with_thumbnail\' );
}
add_action( \'after_setup_theme\', \'wpa_add_child_shortcodes\' );