How do I dynamically populate a shortcode with a variable from URL?
To use get_query_var, you must first register the query variable with the query_vars filter. add_filter( ‘query_vars’, ‘wpse251014_query_vars’ ); function wpse251014_query_vars( $query_vars ) { $query_vars[] = ‘pid’; return $query_vars; } Reference: get_query_var