您可以使用save_post 钩例如，如果您有自定义的帖子类型stack, 挂钩可以更改为save_post_stack.

要将post slug设置为内容的前几个字，请执行以下操作：

add_action( \'save_post_stack\', \'wpse251743_set_title\', 10, 3 );
function wpse251743_set_title ( $post_id ){
    //This temporarily removes action to prevent infinite loops
    remove_action( \'save_post_stack\', \'wpse251743_set_title\' );

    $post = get_post( $post_id );

    $post_content = $post->post_content;

    //GET THE FIRST THREE WORDS
    $words = array_slice(str_word_count( $post_content, 2), 0, 5);

    $post_name = implode(\' \', $words );

    //update title
    wp_update_post( array(
        \'ID\'        => $post_id,
        \'post_name\' =>  $post_name, //Wordpress would generate the slug based on the post name
    ));

    //redo action
    add_action( \'save_post_stack\', \'wpse251743_set_title\', 10, 3 );
}

如果要调用函数，如wp_update_post 其中包括save_post 钩子，钩子函数将创建一个无限循环。为了避免这种情况，请在调用所需函数之前先取消钩住函数，然后再重新钩住它。