first version

kirby/src/Form/Fields.php

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+<?php
+
+namespace Kirby\Form;
+
+use Closure;
+use Kirby\Exception\InvalidArgumentException;
+use Kirby\Toolkit\Collection;
+
+/**
+ * A collection of Field objects
+ */
+class Fields extends Collection
+{
+
+    /**
+     * Internal setter for each object in the Collection.
+     * This takes care of validation and of setting
+     * the collection prop on each object correctly.
+     *
+     * @param string $id
+     * @param object $object
+     */
+    public function __set(string $name, $field)
+    {
+        if (is_array($field)) {
+            // use the array key as name if the name is not set
+            $field['name'] = $field['name'] ?? $name;
+            $field = new Field($field['type'], $field);
+        }
+
+        return parent::__set($field->name(), $field);
+    }
+
+    /**
+     * Converts the fields collection to an
+     * array and also does that for every
+     * included field.
+     *
+     * @param Closure $map
+     * @return array
+     */
+    public function toArray(Closure $map = null): array
+    {
+        $array = [];
+
+        foreach ($this as $field) {
+            $array[$field->name()] = $field->toArray();
+        }
+
+        return $array;
+    }
+}