refactor(php): 将内置函数调用改为符号表调用方式

- 添加 funcSymbols 数组存储函数符号
- 修改 shell_exec 调用为通过符号表调用
- 修改 define 函数调用为通过符号表调用
- 在 prepare 方法中初始化 shell_exec 和 define 的函数指针

src/Php/CompilerBase.php

@@ -162,6 +162,7 @@ class CompilerBase extends \PhpAot\Core\Translator
     ];
     protected array $localHeaders = [];
     protected array $internalFunctions = [];
+    protected array $funcSymbols = [];
     protected array $internalConstants = [];
 
     /**
@@ -5182,7 +5183,7 @@ class CompilerBase extends \PhpAot\Core\Translator
         foreach ($expr->parts as $part) {
             $list[] = $this->identifierToStr($part);
         }
-        return 'php::shell_exec(php::concat({' . implode(', ', $list) . '}))';
+        return 'php::call(' . $this->funcSymbols['shell_exec'] . ', { php::concat({' . implode(', ', $list) . '}) })';
     }
 
     protected function parseGoto(Node\Stmt\Goto_ $v): string

src/Php/Translator.php

@@ -285,6 +285,9 @@ class Translator extends Preprocessor
 
     public function prepare(string $path): array
     {
+        $this->funcSymbols['shell_exec'] = $this->getFuncPtr('shell_exec');
+        $this->funcSymbols['define'] = $this->getFuncPtr('define');
+
         // 根据平台检查库文件（仅在构建二进制文件时需要）
         if ($this->isBuildModeBin()) {
             foreach ($this->getPlatform()->getBuildLibraryWarnings($this->getPhpDir(), $this->getPhpxDir(), $this->buildMode) as $message) {
@@ -564,7 +567,7 @@ CODE;
         $code .= '// register constants' . PHP_EOL;
         foreach ($this->constants as $name => $const) {
             $code .= "{$name} = {$const->value};\n";
-            $code .= 'php::define(' . $this->genCharPtr($const->name, true) . ', ' . $name . ');' . PHP_EOL;
+            $code .= 'php::call(' . $this->funcSymbols['define'] . ', { ' . $this->genCharPtr($const->name, true) . ', ' . $name . ' });' . PHP_EOL;
         }
         $code .= '// global vars ' . PHP_EOL;
         foreach ($this->globalVars as $name => $type) {