wikimedia/mediawiki-extensions-Wikibase

<?php declare( strict_types = 1 );

namespace Wikibase\Repo\RestApi\Infrastructure;

use Wikibase\DataModel\Term\AliasGroupList;
use Wikibase\DataModel\Term\TermList;

/**
 * @license GPL-2.0-or-later
 */
trait ModifiedLanguageCodes {

    /**
     * @param TermList|AliasGroupList $original
     * @param TermList|AliasGroupList $modified
     */
    private function getModifiedLanguageCodes( $original, $modified ): array {
        $original = iterator_to_array( $original );
        $modified = iterator_to_array( $modified );
        $modifiedLanguages = [];

        // handle additions and text changes
        foreach ( $modified as $language => $termOrAliases ) {
            if ( !array_key_exists( $language, $original ) || !$original[ $language ]->equals( $termOrAliases ) ) {
                $modifiedLanguages[] = $language;
            }
        }

        // handle deletions
        foreach ( $original as $language => $termOrAliases ) {
            if ( !array_key_exists( $language, $modified ) ) {
                $modifiedLanguages[] = $language;
            }
        }

        sort( $modifiedLanguages );

        return $modifiedLanguages;
    }

}