diff --git a/src/Php/CompilerBase.php b/src/Php/CompilerBase.php
index b096cc4a..34a61df3 100644
--- a/src/Php/CompilerBase.php
+++ b/src/Php/CompilerBase.php
@@ -2755,7 +2755,7 @@ class CompilerBase extends \PhpAot\Core\Translator
             // 动态调用的函数，转换函数名为带有命名空间的全限定名称
             $name = $this->getNamespacedFuncName($name);
             $code = $this->parseFuncCallWithOptimizer($name, $expr);
-            if ($code) {
+            if ($code !== false) {
                 return $code;
             }
             $placeHolder = $this->identifierToStr($expr->name);
diff --git a/src/Php/FuncCallOptimizer.php b/src/Php/FuncCallOptimizer.php
index 54328e9d..cde7fb36 100644
--- a/src/Php/FuncCallOptimizer.php
+++ b/src/Php/FuncCallOptimizer.php
@@ -152,6 +152,9 @@ trait FuncCallOptimizer
             }
         }
         if ($name === 'strlen') {
+            if ($expr->args[0]->value instanceof Node\Scalar\String_) {
+                return strlen($expr->args[0]->value->value) . $this->getPlatform()->getIntegerLiteralSuffix();
+            }
             return 'php::fn::strlen(' . $getArg(0) . ')';
         }
         if ($name === 'ord') {
diff --git a/tests/aot/optimizations/strlen-const.phpt b/tests/aot/optimizations/strlen-const.phpt
new file mode 100644
index 00000000..23f6daca
--- /dev/null
+++ b/tests/aot/optimizations/strlen-const.phpt
@@ -0,0 +1,18 @@
+--TEST--
+strlen(constant_string) compile-time folding
+--FILE--
+<?php
+function main(): void {
+    var_dump(strlen("hello"));
+    var_dump(strlen(""));
+    var_dump(strlen("hello world"));
+    var_dump(strlen("你好世界"));
+    var_dump(strlen("a" . "b"));
+}
+?>
+--EXPECT--
+int(5)
+int(0)
+int(11)
+int(12)
+int(2)