Title: 500 Server Error with WP User Query/ACF data comparison
Last modified: August 6, 2024

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# 500 Server Error with WP User Query/ACF data comparison

 *  [pmoignard](https://wordpress.org/support/users/pmoignard/)
 * (@pmoignard)
 * [1 year, 9 months ago](https://wordpress.org/support/topic/500-server-error-with-wp-user-query-acf-data-comparison/)
 * Hello, I’ve recently implemented a WP User Query based system for showing and
   filtering users of a specific role at the website I have linked. I’m using ACF
   to store data about each user, and using a form to submit different WP User Query
   arguments via an Ajax call to filter the results. Where I’m having the problem
   is specifically with my dynamically populated form filter options. I started 
   by writing some plugin code to pull all available options from the ACF field 
   object I wanted to create the filter options from, and output them as styled 
   checkboxes for the user to select during a search via a shortcode function. That
   worked fine. However, when I tried to improve the code to compare those field
   object values with options from that object that have been chosen by actual users
   and then ONLY output options from that ACF object that have been chosen at least
   once by a user, my plugin causes a 500 error to occur on the page it is inserted.
   I’ve poured over my code and there doesn’t seem to be anything inherently wrong
   with it’s logic? Thanks in advance for anyone willing to give a fresh set of 
   eyes.
 *     ```wp-block-code
       			  <?php			  // Query to retrieve users where the ACF field is not empty			  $user_query = new WP_User_Query(array(				  'meta_query' => array(					  array(						  'key'     => 'designations', // Replace with your ACF field name						  'compare' => 'EXISTS', // Check if the field exists					  ),				  ),			  ));			  			  // Check if users were found			  if (!empty($user_query->results)) {				  $all_chosen_values = array(); // Array to store all chosen values			  				  // Loop through the users				  foreach ($user_query->results as $user) {					  // Get the values of the ACF field for the user (assuming it's an array)					  $values = get_user_meta($user->ID, 'designations', true); // Replace with your ACF field name			  					  // Check if values is an array					  if (is_array($values)) {						  // Merge values into the all_chosen_values array						  $all_chosen_values = array_merge($all_chosen_values, $values);					  }				  }			  				  // Remove duplicates				  $all_chosen_values = array_unique($all_chosen_values);			  				  // Get the field object				  $field = get_field_object('field_664517d942b6e'); // Replace with ACF field name			  				  if ($field) {					  // Output the chosen values as checkboxes					  foreach ($all_chosen_values as $value) {						  if (array_key_exists($value, $field['choices'])) {							  echo '<div class="form-checkbox-option"><input type="checkbox" id="' . esc_attr($value) . '" name="designations" value="' . esc_attr($value) . '">';							  echo '<label for="' . esc_attr($value) . '">' . esc_html($field['choices'][$value]) . '</label></div>';						  }					  }				  } 				}			  ?>
       ```
   
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2F500-server-error-with-wp-user-query-acf-data-comparison%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 1 replies (of 1 total)

 *  Moderator [threadi](https://wordpress.org/support/users/threadi/)
 * (@threadi)
 * [1 year, 9 months ago](https://wordpress.org/support/topic/500-server-error-with-wp-user-query-acf-data-comparison/#post-17937994)
 * The reason for the error should be visible in the error log. You can find it 
   in your hosting area. If necessary, the support of your hosting can help you.
 * Alternatively, you could also enable debugging in WordPress. How to do this is
   described here: [https://wordpress.org/support/article/debugging-in-wordpress/](https://wordpress.org/support/article/debugging-in-wordpress/)–
   also here the support of your hosting can help you if necessary to edit the file
   accordingly.
 * This way you should see the exact error message behind the 500. And in turn find
   the solution.

Viewing 1 replies (of 1 total)

The topic ‘500 Server Error with WP User Query/ACF data comparison’ is closed to
new replies.

## Tags

 * [ACF](https://wordpress.org/support/topic-tag/acf/)
 * [wp_user_query](https://wordpress.org/support/topic-tag/wp_user_query/)

 * In: [Developing with WordPress](https://wordpress.org/support/forum/wp-advanced/)
 * 1 reply
 * 3 participants
 * Last reply from: [threadi](https://wordpress.org/support/users/threadi/)
 * Last activity: [1 year, 9 months ago](https://wordpress.org/support/topic/500-server-error-with-wp-user-query-acf-data-comparison/#post-17937994)
 * Status: not resolved

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