Wordpress：has_shortcode（） - 如何检测嵌套的短代码

I'm using has_shortcode() to detect a shortcode, it works but not at all. If I put this specified shortcode inside another one the has_shortcode() function stops working.

has_shortcode( $post->post_content, 'slider' )

For example:

[2col] //left column
[slider]
[2col_next] //right column
[slider]
[/2col]

The has_shortcode() function won't work in that case but if I use [slider] shortcode without [2col] it works perfect. This refers to every shortcode. I'm pretty sure that there's nothing wrong with my shortcodes.

Was looking for a solution to this just now. If anyone else is still looking for it then it has been answered here:

https://wordpress.stackexchange.com/questions/126563/has-shortcode-how-to-detect-nested-shortcode

Reworked translation of above link in case it becomes broken:

    function is_shortcode_active() {
        global $post;

        if ( strpos( $post->post_content, '[shortcode' ) ) {
            return true;
        }

        return false;
    }

I changed it a bit from the original linked answer. I just used the $post object instead of other functions and I also removed the / after the opening bracket and left off the closing bracket completely. The reason for leaving off the ending bracket is in case you are tyring to find a shortcode in which users may have added attributes to - if the ] is there then it won't match in those instances.