diff --git a/ext-src/php_swoole.cc b/ext-src/php_swoole.cc
index 3d8d6e4c0e..c9329bc3ca 100644
--- a/ext-src/php_swoole.cc
+++ b/ext-src/php_swoole.cc
@@ -91,7 +91,7 @@ static PHP_FUNCTION(swoole_mime_type_list);
 static PHP_FUNCTION(swoole_substr_unserialize);
 static PHP_FUNCTION(swoole_substr_json_decode);
 static PHP_FUNCTION(swoole_internal_call_user_shutdown_begin);
-static PHP_FUNCTION(swoole_test_fn);  // only for unit tests
+static PHP_FUNCTION(swoole_implicit_fn);
 SW_EXTERN_C_END
 
 // clang-format off
@@ -130,8 +130,9 @@ const zend_function_entry swoole_functions[] = {
     PHP_FE(swoole_clear_dns_cache,    arginfo_swoole_clear_dns_cache)
     PHP_FE(swoole_substr_unserialize, arginfo_swoole_substr_unserialize)
     PHP_FE(swoole_substr_json_decode, arginfo_swoole_substr_json_decode)
-    PHP_FE(swoole_test_fn,            arginfo_swoole_test_fn)
     PHP_FE(swoole_internal_call_user_shutdown_begin, arginfo_swoole_internal_call_user_shutdown_begin)
+    // for test
+    PHP_FE(swoole_implicit_fn,           arginfo_swoole_implicit_fn)
     // for admin server
     ZEND_FE(swoole_get_objects,          arginfo_swoole_get_objects)
     ZEND_FE(swoole_get_vm_status,        arginfo_swoole_get_vm_status)
@@ -1497,24 +1498,32 @@ static PHP_FUNCTION(swoole_substr_json_decode) {
     zend::json_decode(return_value, str + offset, length, options, depth);
 }
 
-static PHP_FUNCTION(swoole_test_fn) {
-    char *test_case;
-    size_t test_case_len;
-    ZEND_PARSE_PARAMETERS_START(1, 1)
-    Z_PARAM_STRING(test_case, test_case_len)
+/**
+ * The implicit functions are intended solely for internal testing and will not be documented.
+ * These functions are unsafe, do not use if you are not an internal developer.
+ */
+static PHP_FUNCTION(swoole_implicit_fn) {
+    char *fn;
+    size_t l_fn;
+    zval *zargs = nullptr;
+
+    ZEND_PARSE_PARAMETERS_START(1, 2)
+    Z_PARAM_STRING(fn, l_fn)
+    Z_PARAM_OPTIONAL
+    Z_PARAM_ZVAL(zargs)
     ZEND_PARSE_PARAMETERS_END();
 
-    if (SW_STRCASEEQ(test_case, test_case_len, "fatal_error")) {
+    if (SW_STRCASEEQ(fn, l_fn, "fatal_error")) {
         swoole_fatal_error(SW_ERROR_FOR_TEST, "test");
         php_printf("never be executed here\n");
-    } else if (SW_STRCASEEQ(test_case, test_case_len, "bailout")) {
-        EG(exit_status) = 95;
+    } else if (SW_STRCASEEQ(fn, l_fn, "bailout")) {
+        EG(exit_status) = zargs ? zval_get_long(zargs) : 95;
 #ifdef SW_THREAD
         php_swoole_thread_bailout();
 #else
         zend_bailout();
 #endif
-    } else if (SW_STRCASEEQ(test_case, test_case_len, "abort")) {
+    } else if (SW_STRCASEEQ(fn, l_fn, "abort")) {
         abort();
     }
 }
diff --git a/ext-src/stubs/php_swoole.stub.php b/ext-src/stubs/php_swoole.stub.php
index 4310b78d4c..b29dd75dfd 100644
--- a/ext-src/stubs/php_swoole.stub.php
+++ b/ext-src/stubs/php_swoole.stub.php
@@ -121,7 +121,7 @@ function swoole_internal_call_user_shutdown_begin(): bool
 }
 
 
-function swoole_test_fn(string $case): void
+function swoole_implicit_fn(string $fn, mixed $args = null): void
 {
 
 }
diff --git a/ext-src/stubs/php_swoole_arginfo.h b/ext-src/stubs/php_swoole_arginfo.h
index 865a16a353..5872be8359 100644
--- a/ext-src/stubs/php_swoole_arginfo.h
+++ b/ext-src/stubs/php_swoole_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: ac43701147665b52de0dce97b7581d37183158a1 */
+ * Stub hash: f3b5724446b5118d9223c66a1045729c7c3ceff7 */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_swoole_version, 0, 0, IS_STRING, 0)
 ZEND_END_ARG_INFO()
@@ -130,6 +130,7 @@ ZEND_END_ARG_INFO()
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_swoole_internal_call_user_shutdown_begin, 0, 0, _IS_BOOL, 0)
 ZEND_END_ARG_INFO()
 
-ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_swoole_test_fn, 0, 1, IS_VOID, 0)
-	ZEND_ARG_TYPE_INFO(0, case, IS_STRING, 0)
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_swoole_implicit_fn, 0, 1, IS_VOID, 0)
+	ZEND_ARG_TYPE_INFO(0, fn, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, args, IS_MIXED, 0, "null")
 ZEND_END_ARG_INFO()
diff --git a/tests/swoole_thread/fatal_error_1.phpt b/tests/swoole_thread/fatal_error_1.phpt
index e15eaf1c81..d4d02eb611 100644
--- a/tests/swoole_thread/fatal_error_1.phpt
+++ b/tests/swoole_thread/fatal_error_1.phpt
@@ -21,7 +21,7 @@ $pm = ProcessManager::exec(function () {
     } else {
         Co\run(function () {
             (function () {
-                swoole_test_fn('fatal_error');
+                swoole_implicit_fn('fatal_error');
             })();
         });
     }
diff --git a/tests/swoole_thread/fatal_error_2.phpt b/tests/swoole_thread/fatal_error_2.phpt
index c9833c61df..234a317528 100644
--- a/tests/swoole_thread/fatal_error_2.phpt
+++ b/tests/swoole_thread/fatal_error_2.phpt
@@ -19,7 +19,7 @@ $pm = ProcessManager::exec(function () {
         echo "stop thread exited\n";
     } else {
         (function () {
-            swoole_test_fn('fatal_error');
+            swoole_implicit_fn('fatal_error');
         })();
     }
     echo "DONE\n";
diff --git a/tests/swoole_thread/server/exit.phpt b/tests/swoole_thread/server/exit.phpt
index 2ac7769673..4187c037d9 100644
--- a/tests/swoole_thread/server/exit.phpt
+++ b/tests/swoole_thread/server/exit.phpt
@@ -12,7 +12,7 @@ require __DIR__ . '/../../include/bootstrap.php';
 use Swoole\Thread;
 use Swoole\Http\Server;
 
-const CODE = 95;
+const CODE = 235;
 const SIZE = 2 * 1024 * 1024;
 $port = get_constant_port(__FILE__);
 
@@ -46,7 +46,7 @@ $serv->on('WorkerStop', function (Server $serv, $workerId) {
 });
 $serv->on('Request', function ($req, $resp) use ($serv) {
     if ($req->server['request_uri'] == '/exit') {
-        swoole_test_fn('bailout');
+        swoole_implicit_fn('exit', CODE);
     }
 });
 $serv->on('shutdown', function () {
diff --git a/tests/swoole_thread/server/reset_concurrency.phpt b/tests/swoole_thread/server/reset_concurrency.phpt
index 92f997c4fb..e7e33434df 100644
--- a/tests/swoole_thread/server/reset_concurrency.phpt
+++ b/tests/swoole_thread/server/reset_concurrency.phpt
@@ -45,7 +45,7 @@ $serv->on('WorkerStop', function (Server $serv, $workerId) {
     echo 'WORKER STOP', PHP_EOL;
 });
 $serv->on('pipeMessage', function (Server $serv, $wid, $msg) {
-    swoole_test_fn('bailout');
+    swoole_implicit_fn('bailout');
 });
 $serv->on('Request', function (Request $req, Response $resp) use ($serv) {
     [$queue, $atomic1, $atomic2] = Thread::getArguments();
@@ -61,7 +61,7 @@ $serv->on('Request', function (Request $req, Response $resp) use ($serv) {
                 $serv->sendMessage('error', $i);
             }
         }
-        swoole_test_fn('bailout');
+        swoole_implicit_fn('bailout');
     } else {
         $stats = $serv->stats();
         Assert::eq($stats['concurrency'], 1);