要仅在生成自动摘录时过滤内容，必须链接挂钩：

钩住get_the_excerpt 并为注册筛选器the_content.示例：

add_filter( \'get_the_excerpt\', \'t5_excerpt_clean_up\', 1 );

/**
 * Register handler for auto-generated excerpt.
 *
 * @wp-hook get_the_excerpt
 * @param   string $excerpt
 * @return  string
 */
function t5_excerpt_clean_up( $excerpt )
{
    if ( ! empty ( $excerpt ) )
        return $excerpt;

    add_filter( \'the_content\', \'t5_excerpt_content\' );

    return $excerpt;
}
/**
 * Strip parts from auto-generated excerpt.
 *
 * @wp-hook the_content
 * @param   string $content
 * @return  string
 */
function t5_excerpt_content( $content )
{
    // Remove immediately; maybe the next post doesn\'t 
    // use an excerpt, but the full content.
    remove_filter( current_filter(), __FUNCTION__ );

    // Fails with nested tables. Just don\'t do that. :)    
    return preg_replace( \'~<(pre|table).*</\\1>~ms\', \'\', $content );
}