FieldsService.php

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<?php

namespace Elgg\Forms;

use Elgg\EventsService;
use Elgg\I18n\Translator;
use Elgg\Traits\Loggable;

class FieldsService {

    use Loggable;
    
    protected $fields = [];

    protected $events;

    protected $translator;

    public function __construct(EventsService $events, Translator $translator) {
        $this->events = $events;
        $this->translator = $translator;
    }
    
    public function get(string $type, string $subtype): array {
        if (isset($this->fields[$type][$subtype])) {
            return $this->fields[$type][$subtype];
        }
        
        $result = (array) $this->events->triggerResults('fields', "{$type}:{$subtype}", [
            'type' => $type,
            'subtype' => $subtype,
        ], []);
        
        $fields = [];
        // validate fields and generate labels
        foreach ($result as $field) {
            if (empty($field['name']) || empty($field['#type'])) {
                $this->getLogger()->warning("Field config for '{$type}:{$subtype}' is missing 'name' or '#type' in field: " . print_r($field, true));
                continue;
            }
            
            if (!isset($field['#label'])) {
                $label_key = "fields:{$type}:{$subtype}:{$field['name']}";
                if ($this->translator->languageKeyExists($label_key)) {
                    $field['#label'] = $this->translator->translate($label_key);
                }
            }
            
            $fields[] = $field;
        }
        
        $this->fields[$type][$subtype] = $fields;
        
        return $fields;
    }
}