diff --git a/src/Php/CompilerBase.php b/src/Php/CompilerBase.php
index 90cd516b..0fbae6a9 100644
--- a/src/Php/CompilerBase.php
+++ b/src/Php/CompilerBase.php
@@ -2185,11 +2185,21 @@ class CompilerBase extends \PhpAot\Core\Translator
         $this->error("{$msg} in {$this->file}:{$node->getStartLine()}");
     }
 
+    protected function warning(Node $node, string $msg): void
+    {
+        $this->climate->yellow("{$msg} in {$this->file}:{$node->getStartLine()}");
+    }
+
     protected function errorUndefinedVariable(Variable $node): never
     {
         $this->fatalError($node, "The variable `\${$node->name}` is undefined");
     }
 
+    protected function warningUndefinedBehavior(NodeAbstract $expr): void
+    {
+        $this->warning($expr, 'Use this expression carefully, which may be inconsistent with the dynamic execution behavior');
+    }
+
     protected function dump(NodeAbstract $v): void
     {
         if ($this->debugLine == $v->getStartLine()) {
diff --git a/src/Php/FuncCallOptimizer.php b/src/Php/FuncCallOptimizer.php
index 216069b5..926dd2d5 100644
--- a/src/Php/FuncCallOptimizer.php
+++ b/src/Php/FuncCallOptimizer.php
@@ -14,6 +14,7 @@ trait FuncCallOptimizer
 {
     public function genFuncGetArgs(string $name, Node\Expr\FuncCall $expr): string
     {
+        $this->warningUndefinedBehavior($expr);
         $funcDef = $this->functionDef;
         $list = [];
         foreach ($funcDef->argInfoList as $i => $argInfo) {
@@ -30,6 +31,7 @@ trait FuncCallOptimizer
 
     public function genFuncGetArg(string $name, Node\Expr\FuncCall $expr)
     {
+        $this->warningUndefinedBehavior($expr);
         $position = $expr->args[0]->value;
         if ($this->isScalarInt($position)) {
             $funcDef = $this->functionDef;
@@ -109,6 +111,7 @@ trait FuncCallOptimizer
 
     protected function genFuncNumArgs(string $name, Node\Expr\FuncCall $expr): string
     {
+        $this->warningUndefinedBehavior($expr);
         $funcDef = $this->functionDef;
         foreach ($funcDef->argInfoList as $i => $argInfo) {
             if ($argInfo->variadic) {