fix(aot): 修复链式操作中变量访问顺序问题

- 在编译器基础类中反转变量链表顺序
- 确保变量访问按正确顺序执行
- 添加对空值检查的测试用例
- 验证数组元素访问的正确性

src/Php/CompilerBase.php

@@ -3705,6 +3705,8 @@ class CompilerBase extends \PhpAot\Core\Translator
             $expr = $expr->var;
         }
 
+        $list = array_reverse($list);
+
         if ($getValue) {
             $result = $this->addTmpVar(self::TYPE_VAR);
             $node->setAttribute('chainOpResult', $result);

tests/aot/empty/001.phpt

@@ -0,0 +1,39 @@
+--TEST--
+empty()
+--FILE--
+<?php
+class Foo
+{
+    protected $grid;
+    public $result = 0;
+
+    public function __construct(array $grid)
+    {
+        $this->grid = $grid;
+    }
+
+    public function bar()
+    {
+        var_dump(empty($this->grid));
+        var_dump(empty($this->grid[0]));
+        var_dump(empty($this->grid[1][2]));
+        var_dump(empty($this->grid[1][5]));
+    }
+}
+
+function main()
+{
+    $arr = [
+        [0, 1, 0, 0],
+        [1, 1, 1, 0],
+    ];
+
+    $o = new Foo($arr);
+    $o->bar();
+}
+?>
+--EXPECTF--
+bool(false)
+bool(false)
+bool(false)
+bool(true)