Pass php dynamic variable to shortcode

I am not sure if there is a simple solution to my problem. The requirement looks simple but unable to find answer even after breaking my head for 6 hours.
I have to pass variable from a php function to a shortcode and this shortcode has to pass on the this variable to another shortcode. Shortcode-1 will open a popup and the content of the popup is created by shortcode-2, content has to be changed based on the variable. How can I acheive this?

Code in my template..

 <a href="#" class="open-popup-1" variable= <?php getid(); ?>"> <?php  echo "Click here"?> </a> 

popup shortcode:

[modifycontent id=$variable] 

My shortcode function

function modifycontent($atts = [], $content = null)
{
// do something to $content

 $var = atts['id']; 

 $content = gettherightcontent($var); 
 return $content;
}
add_shortcode('mc', 'modifycontent');

I tried like this, I managed to call my shortcode but unable to pass the variable.