fix(php): 修复函数use语句解析问题

- 修正useFunctions映射返回值，确保函数名正确拼接
- 修复use语句类型判断逻辑，处理未知类型情况
- 添加any函数polyfill支持
- 新增函数use测试用例验证功能正确性

examples/error/undef-var.php

@@ -0,0 +1,5 @@
+<?php
+function main()
+{
+    var_dump($testVar);
+}

src/Php/CompilerBase.php

@@ -705,7 +705,7 @@ class CompilerBase extends \PhpAot\Core\Translator
             return ltrim($funcName, '\\');
         }
         if (isset($this->useFunctions[$funcName])) {
-            return $this->useFunctions[$funcName];
+            return $this->useFunctions[$funcName] . '\\' . $funcName;
         }
         return $funcName;
     }
@@ -4679,7 +4679,8 @@ class CompilerBase extends \PhpAot\Core\Translator
         $code = '';
         foreach ($v2->uses as $use) {
             $id = $this->parseIdentifier($use->name);
-            if ($use->type === Node\Stmt\Use_::TYPE_FUNCTION) {
+            $type = $use->type !== Node\Stmt\Use_::TYPE_UNKNOWN ? $use->type : $v2->type;
+            if ($type === Node\Stmt\Use_::TYPE_FUNCTION) {
                 $lastIndex = strrpos($id, '\\');
                 $fn = substr($id, $lastIndex + 1);
                 $ns = substr($id, 0, $lastIndex);

src/polyfills.php

@@ -43,3 +43,8 @@ function &refval(&$var)
 {
     return $var;
 }
+
+function any(mixed $var): mixed
+{
+    return $var;
+}

tests/aot/namespace/use-func.phpt

@@ -0,0 +1,20 @@
+--TEST--
+use function
+--FILE--
+<?php
+namespace App\Foo {
+    function bar() {
+        var_dump(__FUNCTION__);
+    }
+}
+
+namespace {
+    use function App\Foo\bar;
+    function main()
+    {
+        bar();
+    }
+}
+?>
+--EXPECT--
+string(11) "App\Foo\bar"