refactor(php): 优化代码结构并添加测试用例

- 修复了AstNodeType.php中的命名空间引用问题
- 将parseTrait方法从Translator.php末尾移至中间位置
- 添加了ref 002测试用例验证数组引用行为
- 统一了代码风格和导入语句格式

src/Php/AstNodeType.php

@@ -145,6 +145,6 @@ trait AstNodeType
 
     protected function isNull(NodeAbstract $expr): bool
     {
-        return $expr instanceof Node\Expr\ConstFetch && $expr->name->toString() === 'null';
+        return $expr instanceof Expr\ConstFetch && $expr->name->toString() === 'null';
     }
 }

src/Php/Translator.php

@@ -1247,6 +1247,11 @@ class Translator extends Preprocessor
         return $code;
     }
 
+    protected function parseTrait(Node\Stmt\Trait_ $trait)
+    {
+        throw new Unsupported('Unsupported Trait ');
+    }
+
     private function getRegisterClassFunctionArgDef(ClassDef|InterfaceDef $classDef): string
     {
         $depsCeList = $this->getRegisterClassFunctionCeList($classDef);
@@ -1367,9 +1372,4 @@ class Translator extends Preprocessor
 
         return $code;
     }
-
-    protected function parseTrait(Node\Stmt\Trait_ $trait)
-    {
-        throw new Unsupported('Unsupported Trait ');
-    }
 }

tests/aot/ref/002.phpt

@@ -0,0 +1,23 @@
+--TEST--
+ref 002
+--FILE--
+<?php
+function main()
+{
+    $a = [1, 2, 3];
+    $b = &$a;
+    $b[] = 5;
+    var_dump($a);
+}
+?>
+--EXPECT--
+array(4) {
+  [0]=>
+  int(1)
+  [1]=>
+  int(2)
+  [2]=>
+  int(3)
+  [3]=>
+  int(5)
+}