我正在尝试向WordPress自定义程序功能添加一些控件，但从控件中提取数字值以用于主题时遇到问题。该部分显示在Customizer选项卡中，我可以更改输入，但控件对主题没有影响。

我查阅了使用get\\u theme\\u mod和inline样式来设置div属性的教程，但我还没有弄清楚如何使控件id只返回自定义数值的输入。

$wp_customize->add_section( 
     "news_portal_grid_section", 
     array(
    \'title\'     => esc_html__( \'Grid Style\', \'news-portal-child\' ),
    \'panel\'     => \'news_portal_grid_settings_panel\',
    \'priority\'  => 25,
    )       
);   

$wp_customize->add_setting( 
     \'np_posts_per_page\', 
     array(          
    \'default\'           => \'6\',
    \'sanitize_callback\' => \'sanitize_key\',
    )       
);  
$wp_customize->add_control(new WP_Customize_Control ($wp_customize,
    \'np_posts_per_page\',
     array(
            \'type\'     => \'text\',
            \'section\'   => \'news_portal_grid_section\',
            \'settings\'   => \'np_posts_per_page\',
            \'priority\' => 2,
            \'label\' => __( \'Grid Posts\' ),
            \'description\' => __( \'This sets the number of posts to display.  This must be numeric.\' ),
            \'validate\' => \'numeric\',
            \'default\'  => \'5\',
            \'input_attrs\' => array(
                \'min\' => 0,
                \'max\' => 50,
                \'step\' => 1,
            ),

   )) );

我知道这里应该有一个函数/动作挂钩，但WordPress API在如何准确实现这一点上有点模糊。我需要np_post_num（）的数字输出作为一个简单的整数或字符串返回，然后可以在$option_pg_number=_________;中声明。

function np_post_num(){
echo get_theme_mod(\'np_posts_per_page\', \'5\'); 
}
add_action (\'wp_head\', \'np_post_num\'); 

$option_pg_number = get_theme_mod(\'np_posts_per_page\', \'5\');