FileBackendStoreShardDirIterator.php

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<?php
class FileBackendStoreShardDirIterator extends FileBackendStoreShardListIterator {
    protected function listFromShard( $container ) {
        $list = $this->backend->getDirectoryListInternal(
            $container, $this->directory, $this->params );
        if ( $list === null ) {
            return new ArrayIterator( [] );
        } else {
            return is_array( $list ) ? new ArrayIterator( $list ) : $list;
        }
    }
}