PrepareFields.php

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<?php
 
namespace Elgg\Forms;
 
class PrepareFields {
    
    public function __invoke(\Elgg\Event $event): ?array {
        if (!(bool) $event->getParam('sticky_enabled')) {
            return null;
        }
        
        $form_name = $event->getParam('sticky_form_name');
        if (empty($form_name) || !elgg_is_sticky_form($form_name)) {
            return null;
        }
        
        $ignored_fields = (array) $event->getParam('sticky_ignored_fields');
        $body_vars = $event->getValue();
        
        // merge the sticky values into the fields
        $sticky_vars = elgg_get_sticky_values($form_name);
        foreach ($sticky_vars as $key => $value) {
            if (in_array($key, $ignored_fields)) {
                // this shouldn't happen, but just in case
                continue;
            }
            
            $body_vars[$key] = $value;
        }
        
        // clear the sticky values
        elgg_clear_sticky_form($form_name);
        
        return $body_vars;
    }
}