diff --git a/guide/src/types/functions.md b/guide/src/types/functions.md
index ea2f42d..c8d7b03 100644
--- a/guide/src/types/functions.md
+++ b/guide/src/types/functions.md
@@ -16,14 +16,14 @@ use ext_php_rs::zend::Function;
 
 #[php_function]
 pub fn test_function() -> () {
-    let substr = Function::from_function("var_dump");
-    let _ = substr.try_call(vec!["abc"]);
+    let var_dump = Function::from_function("var_dump");
+    let _ = var_dump.try_call(vec![&"abc"]);
 }
 
 #[php_function]
 pub fn test_method() -> () {
     let f = Function::from_method("ClassName", "staticMethod");
-    let _ = f.try_call(vec!["abc"]);
+    let _ = f.try_call(vec![&"abc"]);
 }
 
 # fn main() {}
diff --git a/guide/src/types/object.md b/guide/src/types/object.md
index abde18d..57f9371 100644
--- a/guide/src/types/object.md
+++ b/guide/src/types/object.md
@@ -24,9 +24,8 @@ use ext_php_rs::{prelude::*, types::ZendObject};
 
 // Take an object reference and also return it.
 #[php_function]
-pub fn take_obj(obj: &mut ZendObject) -> &mut ZendObject {
-    let res = obj.try_call_method("hello", vec!["arg1", "arg2"]);
-    dbg!(res)
+pub fn take_obj(obj: &mut ZendObject) -> () {
+    let _ = obj.try_call_method("hello", vec![&"arg1", &"arg2"]);
 }
 # #[php_module]
 # pub fn get_module(module: ModuleBuilder) -> ModuleBuilder {