fix(php): 修复AOT编译器中isset操作和属性获取问题

- 添加变量存在性检查，防止AOT编译器操作未定义变量
- 优化单属性读取逻辑，支持原生属性访问
- 移除不必要的数组反转操作提升性能
- 修复属性映射偏移量计算错误，统一加减1024补偿值
- 更新示例代码中的静态变量初始值

examples/micro_bench.php

@@ -23,7 +23,7 @@ function simpleicall($n)
 }
 
 class Foo {
-    static $a = 0;
+    static $a = 12;
     public $b = 0;
     const TEST = 23;
 

src/Php/CompilerBase.php

@@ -3648,15 +3648,20 @@ class CompilerBase extends \PhpAot\Core\Translator
 
     protected function parseChainedExpr(NodeAbstract $node, string $op, bool $getValue = false): string
     {
+        // AOT 编译器不允许操作未定义的变量，PHP 的 isset($var) 可能 $var 未定义
+        $this->checkVarMustExist($node, $this->parseIdentifier($node));
         $fn = $this->getChainedFunc($op);
         $expr = $node;
         if ($this->isVarExpr($expr)) {
-            if ($op === self::OP_ISSET) {
-                $var = $this->parseIdentifier($expr);
-                return $this->hasVar($var) ? $fn . '(' . $var . ')' : 'false';
-            }
             return $fn . '(' . $this->parseExpr($expr) . ')';
         }
+        // 单属性读取（非链式）
+        if ($this->isPropertyFetch($expr) and $this->isVarExpr($expr->var) and $this->isIdExpr($expr->name)) {
+            $prop = $this->parsePropertyFetch($expr);
+            if ($expr->hasAttribute('nativeProperty')) {
+                return $fn . '(' . $prop . ')';
+            }
+        }
 
         $list = [];
         while (true) {
@@ -3681,8 +3686,6 @@ 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);

src/template/extension.cc.php

@@ -58,9 +58,9 @@ zend_function *php_get_method(int func_id, const php::Str &method_name, int clas
 
 uint32_t php_get_prop(int prop_id, const php::Str &prop_name, int class_id, const php::Str &class_name) {
     if (UNEXPECTED(<?= Translator::PREFIX . Translator::PROP_MAP ?>[prop_id] == 0)) {
-        <?= Translator::PREFIX . Translator::PROP_MAP ?>[prop_id] = php::getPropertyOffset(class_name, prop_name);
+        <?= Translator::PREFIX . Translator::PROP_MAP ?>[prop_id] = php::getPropertyOffset(class_name, prop_name) + 1024;
     }
-    return <?= Translator::PREFIX . Translator::PROP_MAP ?>[prop_id];
+    return <?= Translator::PREFIX . Translator::PROP_MAP ?>[prop_id] - 1024;
 }
 
 // literal strings