Profile: vimalS

Problem:
How to pass attribute to view's PHP API'
Solution:
You can simply add attribute to view's PHP API using array.

For example:

$args = array( 'wpvprchildof'=> $atts['wpvprchildof'], 'ids'=> $atts['ids']);

You can find proposed solution, in this case, with the following reply:
=> https://toolset.com/forums/topic/to-be-continue-get-number-of-results-for-view-filtered-by-shortcode-attribute/#post-642252

Relevant Documentation:

Problem: I would like to use get_view_query_results to find the number of results for a View, filtered by a shortcode attribute.

Solution:
The 4th argument of the get_view_query_results function takes an array of arguments, like those you would add as View shortcode attributes. In order to pass that into the get_view_query_results function, you probably need to add it as an attribute in your custom shortcode like this:

function get_students_count( $atts )
{
    $atts = shortcode_atts( [
      'wpvprchildof' => 0
    ], $atts );
    $args = array( 'wpvprchildof'=> $atts['wpvprchildof'] );
    $filtered_posts = get_view_query_results(258, null, null, $args);
    return count($filtered_posts);
}
add_shortcode( 'wpv-students-count', 'get_students_count' );

Then use the shortcode like this:

[wpv-students-count wpvprchildof='[wpv-post-id]'][/wpv-students-count]

Relevant Documentation:
https://toolset.com/documentation/programmer-reference/views-api/#get_view_query_results