Problem assigning by reference [closed]

The issue is that you’re attempting to store output of a method by reference to $starredgroup_products, which is not possible.

This should fix it (untested):

$starredgroup          = $myPage->getGroup( $starredgroup );
$starredgroup_id       = $starredgroup['groupid']; 
$starredgroup_products = $myPage->getStarredProducts( $starredgroup_id );

Related Posts:

  1. Why is WordPress code so “space-happy”?
  2. Sandwich Coding Standards
  3. Why does WordPress reverse conditional statements?
  4. spaces inside parenthesis
  5. Exit or die in main plugin file breaking php standards recommendation
  6. How could I better initialize a method from my class?
  7. $wpdb->prepare referencing a const without a coding guideline warning
  8. phpcs, phpcbf and loose comparisons
  9. Why isn’t WordPress part of Framework Interop Group?
  10. How to name files of namespaced classes?
  11. When to use Exceptions vs Error Objects vs just plain false/null
  12. Actions, functions and conditionals
  13. WordPress and event-driven programming – what is it about?
  14. How should I document function calls?
  15. PHP Coding Standards, Widgets and Sanitization
  16. how to escape wp_oembed_get for phpcs
  17. Avoiding “Usage of a direct database call is discouraged”
  18. Using global $post v/s $GLOBALS[‘post’]
  19. Nonce in settings API with tabbed navigation
  20. What to do when theme and WordPress coding standards conflict?
  21. WP Coding standards – escaping the inescapable?
  22. What is WordPress file encoding?
  23. How Flexible are the WordPress Coding Standards for PHPCS?
  24. Correct processing of `$_POST`, following WordPress Coding Standards
  25. How to set up phpcs with WordPress coding standard with PHP8?
  26. Are we allowed to use the Allman (BSD) indent style when coding WordPress plugins and themes?
  27. Hyphens instead of Underscores in Post-type Archive Template Filenames when Post-type handle contains underscore
  28. Can I use namespaces in my plugin?
  29. PHPCS: Strings should have translatable content
  30. Assignments must be the first block of code on a line Validation Error on Travis
  31. WordPress mode for emacs?
  32. Is it better to create a function or a variable for current_theme_supports?
  33. Prefixing plugin hooks (actions/filters) with a wrapper class or functions
  34. Strange glyphs code error
  35. Should I check for privileges before hooking into `wp_ajax_$handle` or after?
  36. Add comments for template variables
  37. What’s the best practice way of handling custom fields in different post formats?
  38. What make possible unit test plugins?
  39. REQUIRED: Could not find wp_link_pages. See: wp_link_pages by Theme Checker
  40. Translate a Constant while appeasing WordPress PHPCS
  41. Do define() statements need phpDocumentor-style docblocks?
  42. Why the WP Core team does not allow filter_* functions? [closed]
  43. WordPress Theme Validator?
  44. Understanding how the class family `inner-container` works
  45. Class or function wrapper for plugin code
  46. Is there a common structure for a wordpress formular?
  47. Check if almost 10 year old – working code is up to date
  48. Should I use wp_cache in my plugin to make it faster?
  49. WP nonce verification
  50. Standard technique for AJAX post endpoint: WP REST or WP API?
  51. PHP Code Sniffer – WordPress VIP Coding Standards
  52. Sanitization html output itself
  53. How to automatically convert “normal” conditions to yoda conditions
  54. How can one use variables in a template or template part without polluting the global scope?
  55. May I know where to edit the tax rate?
  56. plugin development code standard not matching for SQL query