Add support of nested objects/arrays + refactoring FormModel (#253)

.editorconfig

@@ -10,8 +10,12 @@ indent_style = space
 indent_size = 4
 trim_trailing_whitespace = true
 
+[*.php]
+ij_php_space_before_short_closure_left_parenthesis = false
+ij_php_space_after_type_cast = true
+
 [*.md]
 trim_trailing_whitespace = false
 
 [*.yml]
-indent_size = 2
+indent_size = 2

src/FormMetadataInterface.php

@@ -32,6 +32,8 @@ public function getAttributeLabel(string $attribute): string;
      *
      * @return array attribute labels (name => label)
      *
+     * @psalm-return array<string,string>
+     *
      * {@see \Yiisoft\Form\FormModel::getAttributeLabel()}
      */
     public function getAttributeLabels(): array;
@@ -58,6 +60,8 @@ public function getAttributeHint(string $attribute): string;
      * child hints using functions such as `array_merge()`.
      *
      * @return array attribute hints (name => hint)
+     *
+     * @psalm-return array<string,string>
      */
     public function getAttributeHints(): array;
 
@@ -74,6 +78,8 @@ public function getAttributePlaceholder(string $attribute): string;
      * Returns the attribute placeholders.
      *
      * @return array attribute placeholder (name => placeholder)
+     *
+     * @psalm-return array<string,string>
      */
     public function getAttributePlaceholders(): array;
 }