feat(php): 实现 compact 函数支持并增强函数重定义检查

- 添加 compact 函数的功能实现和语法优化
- 移除 UNSUPPORTED_FUNCTIONS 列表中的 compact 条目
- 在 Preprocessor 中添加防止重定义内置函数的检查
- 实现 genCompact 方法来处理 compact 函数调用
- 添加测试用例验证 compact 函数功能正确性
- 增强错误处理机制以捕获非法变量使用情况

src/Php/Constants.php

@@ -58,7 +58,6 @@ class Constants
     ];
 
     public const UNSUPPORTED_FUNCTIONS = [
-        'compact',
         'extract',
     ];
 }

src/Php/FuncCallOptimizer.php

@@ -126,6 +126,9 @@ trait FuncCallOptimizer
                 return 'true';
             }
         }
+        if ($name === 'compact') {
+            return $this->genCompact($expr);
+        }
         if ($name === 'get_class') {
             return $this->genGetClass($expr);
         }
@@ -166,4 +169,29 @@ trait FuncCallOptimizer
         }
         return 'php::fn::get_class(' . $this->parseIdentifier($object) . ')';
     }
+
+    protected function genCompact(Node\Expr\FuncCall $expr): string
+    {
+        $list = [];
+
+        $this->indentLevel++;
+        foreach ($expr->args as $arg) {
+            if (!$this->isScalarString($arg->value)) {
+                $this->fatalError($expr, 'The argument of compact function can only be literal string');
+            }
+            $var = $arg->value->value;
+            if (!$this->hasVar($var)) {
+                $this->errorUndefinedVariable($var);
+            }
+            if ($this->isSuperGlobal($var)) {
+                $this->fatalError($expr, 'Cannot use super global variable `' . $var . '` in compact function');
+            }
+
+            $key = $this->getLiteralString($var);
+            $list[] = $this->getIndent() . '{ ' . $key . '.str(), ' . $var . ' }';
+        }
+        $this->indentLevel--;
+
+        return $this->genArray($list);
+    }
 }

src/Php/Preprocessor.php

@@ -369,6 +369,10 @@ class Preprocessor extends CompilerBase
         if ($this->hasFunction($name)) {
             $this->fatalError($v, "Duplicate function `{$name}`");
         }
+        // 禁止重定义内置函数
+        if (!$this->methodDef and $this->isInternalFunction($name)) {
+            $this->fatalError($v, "The function `{$name}` is a built-in function and cannot be redefined");
+        }
         $functionDef = $this->parseFunctionDecl($v);
         $this->addFunction($name, $functionDef);
         if ($this->methodDef) {

tests/aot/functions/compact.phpt

@@ -0,0 +1,22 @@
+--TEST--
+compact
+--FILE--
+<?php
+function main()
+{
+    $city  = "San Francisco";
+    $state = "CA";
+    $event = "SIGGRAPH";
+    $result = compact("event", "city", "state");
+    var_dump($result);
+}
+?>
+--EXPECT--
+array(3) {
+  ["event"]=>
+  string(8) "SIGGRAPH"
+  ["city"]=>
+  string(13) "San Francisco"
+  ["state"]=>
+  string(2) "CA"
+}