Next major version 2 with PHP 8.1, Symfony 6, Tabler UI, 2FA ... (#2902)

src/Form/DataTransformer/StringToArrayTransformer.php

@@ -0,0 +1,58 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Form\DataTransformer;
+
+use Symfony\Component\Form\DataTransformerInterface;
+use Symfony\Component\Form\Exception\TransformationFailedException;
+
+/**
+ * @implements DataTransformerInterface<array, string>
+ */
+final class StringToArrayTransformer implements DataTransformerInterface
+{
+    /**
+     * @param non-empty-string $separator
+     */
+    public function __construct(private readonly string $separator = ',')
+    {
+    }
+
+    /**
+     * Transforms an array of strings to a string.
+     *
+     * @param array<string> $value
+     * @return string
+     */
+    public function transform(mixed $value): mixed
+    {
+        if (empty($value)) {
+            return '';
+        }
+
+        return implode($this->separator, $value);
+    }
+
+    /**
+     * Transforms a string to an array of tags.
+     *
+     * @param string|null $value
+     * @return array<string>
+     * @throws TransformationFailedException
+     */
+    public function reverseTransform(mixed $value): mixed
+    {
+        // check for empty list
+        if ('' === $value || null === $value) {
+            return [];
+        }
+
+        return array_filter(array_unique(array_map('trim', explode($this->separator, $value))));
+    }
+}