From 898cbe255369a1e1f9d591874d3a15277d6fcc1f Mon Sep 17 00:00:00 2001
From: tianfenghan <rango@swoole.com>
Date: Mon, 30 Mar 2026 17:02:47 +0800
Subject: [PATCH] =?UTF-8?q?feat(php):=20=E6=94=AF=E6=8C=81=20func=5Fnum=5F?=
 =?UTF-8?q?args=20=E5=87=BD=E6=95=B0=E4=BC=98=E5=8C=96?=
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- 从 UNSUPPORTED_FUNCTIONS 列表中移除 func_num_args
- 添加 func_num_args 函数的运行时测试用例
- 实现 func_num_args 函数调用优化逻辑
- 支持通过 argInfoList 计算函数参数数量
- 添加对可变参数函数的支持
---
 src/Php/Constants.php                  |  1 -
 src/Php/FuncCallOptimizer.php          | 12 +++++++++++
 tests/aot/functions/func_num_args.phpt | 29 ++++++++++++++++++++++++++
 3 files changed, 41 insertions(+), 1 deletion(-)
 create mode 100644 tests/aot/functions/func_num_args.phpt

diff --git a/src/Php/Constants.php b/src/Php/Constants.php
index 2fca7b6f..1b41e3de 100644
--- a/src/Php/Constants.php
+++ b/src/Php/Constants.php
@@ -59,7 +59,6 @@ class Constants
     public const UNSUPPORTED_FUNCTIONS = [
         'compact',
         'extract',
-        'func_num_args',
         'func_get_arg',
         'func_get_args',
     ];
diff --git a/src/Php/FuncCallOptimizer.php b/src/Php/FuncCallOptimizer.php
index be16620b..c1b330fa 100644
--- a/src/Php/FuncCallOptimizer.php
+++ b/src/Php/FuncCallOptimizer.php
@@ -56,6 +56,18 @@ trait FuncCallOptimizer
         if ($name === 'array_key_exists') {
             return $getArg(1) . '.offsetExists(' . $getArg(0) . ')';
         }
+        if ($name === 'func_get_args') {
+
+        }
+        if ($name === 'func_num_args') {
+            $funcDef = $this->functionDef;
+            foreach ($funcDef->argInfoList as $i => $argInfo) {
+                if ($argInfo->variadic) {
+                    return '(' . $argInfo->name . '.count() + ' . $i . ')';
+                }
+            }
+            return count($funcDef->argInfoList);
+        }
         if ($name === 'function_exists') {
             $funcName = $expr->args[0]->value;
             if ($this->isScalarString($funcName)) {
diff --git a/tests/aot/functions/func_num_args.phpt b/tests/aot/functions/func_num_args.phpt
new file mode 100644
index 00000000..d0650222
--- /dev/null
+++ b/tests/aot/functions/func_num_args.phpt
@@ -0,0 +1,29 @@
+--TEST--
+func_num_args
+--FILE--
+<?php
+
+function foo1($a, $b, $c = 10)
+{
+    var_dump(func_num_args());
+}
+
+function foo2(...$args) {
+    var_dump(func_num_args());
+}
+
+function foo3($a, $b, $c, ...$args) {
+    var_dump(func_num_args());
+}
+
+function main()
+{
+   foo1(2.5, 3);
+   foo2(1, 3, 5, 8, 10);
+   foo3(1, 3, 5, 8, 10, 12);
+}
+?>
+--EXPECT--
+int(3)
+int(5)
+int(6)
\ No newline at end of file