new appraoch

pancake/system/vendor/league/csv/src/MapIterator.php

@@ -0,0 +1,44 @@
+<?php
+
+/**
+ * League.Csv (https://csv.thephpleague.com)
+ *
+ * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace League\Csv;
+
+use IteratorIterator;
+use ReturnTypeWillChange;
+use Traversable;
+
+/**
+ * Map value from an iterator before yielding.
+ *
+ * @internal used internally to modify CSV content
+ */
+final class MapIterator extends IteratorIterator
+{
+    /** @var callable The callback to apply on all InnerIterator current value. */
+    private $callable;
+
+    public function __construct(Traversable $iterator, callable $callable)
+    {
+        parent::__construct($iterator);
+        $this->callable = $callable;
+    }
+
+    /**
+     * @return mixed The value of the current element.
+     */
+    #[ReturnTypeWillChange]
+    public function current()
+    {
+        return ($this->callable)(parent::current(), parent::key());
+    }
+}