View file File name : Transform.php Content :<?php namespace WP_CLI\Iterators; use IteratorIterator; /** * Applies one or more callbacks to an item before returning it. */ class Transform extends IteratorIterator { private $transformers = []; public function add_transform( $fn ) { $this->transformers[] = $fn; } #[\ReturnTypeWillChange] public function current() { $value = parent::current(); foreach ( $this->transformers as $fn ) { $value = call_user_func( $fn, $value ); } return $value; } }