一个新闻聚合器希望RSS提要不包含指向<description> 领域所以我尝试在functions.php 删除<a href></a> 标签，但它不起作用。怎么了？如何删除标记，但保持所有文本的完整性？

add_filter(\'the_content\', \'my_custom_feed\');
function my_custom_feed( $content ){
    global $post;

    if ( ! is_feed() )
        return $content;

    // Remove all shortcodes
    $content = strip_shortcodes( $post->post_content );
        $content = strip_tags( $content );

    // Remove all html tags, except these
    $my_allowed_tags = array(
        \'p\'      => array(),
        \'strong\' => array(),
        \'em\'     => array(),
        \'img\'    => array( \'src\' => array(), \'width\' => array(), \'height\' => array() ),
    );
    $content = wp_kses( $content, $my_allowed_tags );

    // Balance tags
    $content = balanceTags( $content, true );

    return $content;
}