使用slug“Gorsoph”从类别中获取10篇帖子，在循环中获取帖子子项，按mime类型筛选以获取适当的文件，添加到列表中

/**
 * get 10 post from category with SLUG gospel
 */
$args = array(
    \'category_name\' => \'gospel\',
    \'posts_per_page\' => 10
);
$songs = array();
$the_query = new WP_Query( $args );
if ( $the_query->have_posts() ) {
    while ( $the_query->have_posts() ) {
        $the_query->the_post();
        /**
         * get post children, filter by post_mime_type, limit 1
         */
        $args = array(
            \'post_parent\' => get_the_ID(),
            \'post_type\'   => \'attachment\', 
            \'posts_per_page\' => 1,
            \'post_status\' => \'any\',
            \'post_mime_type\' => \'audio\'
        );
        $attachments = get_children( $args );
        if ( $attachments ) {
            foreach ( $attachments as $attachment ) {
                $songs[] = wp_get_attachment_url( $attachment->ID);

            }
        }
    }
}
/**
 * print songs
 */
print_r($songs);
/**
 * reset postdata
 */
wp_reset_postdata();