Fix some compilation issues

Author: nikeee

guide/src/macros/classes.md

@@ -88,10 +88,11 @@ The following example implements [`ArrayAccess`](https://www.php.net/manual/en/c
 # #![cfg_attr(windows, feature(abi_vectorcall))]
 # extern crate ext_php_rs;
 use ext_php_rs::prelude::*;
-use ext_php_rs::{exception::PhpException, zend::ce, types::Zval};
+use ext_php_rs::{exception::PhpResult, types::Zval, zend::ce};
 
 #[php_class]
 #[implements(ce::arrayaccess())]
+#[derive(Default)]
 pub struct EvenNumbersArray;
 
 /// Returns `true` if the array offset is an even number.
@@ -125,4 +126,9 @@ impl EvenNumbersArray {
         Err("Setting values is not supported".into())
     }
 }
+# #[php_module]
+# pub fn get_module(module: ModuleBuilder) -> ModuleBuilder {
+#     module
+# }
+# fn main() {}
 ```