MODX: Redirect to parent resource

parentRedirect.snippet.php

<?php

/*
Purpose: Redirect a child resource that is only used to structure content of its parent.

Usage: Add this snippet to your child template

    [[!parentRedirect? 
        &parent=`[[*parent]]` 
        &alias=`[[*alias]]`
    ]]
    
Result: If a resource with this snippet inside its template is viewed, it will be redirected to its parent resource. 
If you add an alias based on id to your output, the viewport will automatically home in on the content of your child resource.
*/

$url = $modx->makeUrl($parent, '', '', 'https')."#".$alias;

$modx->sendRedirect($url);