diff --git a/phper-sys/php_wrapper.c b/phper-sys/php_wrapper.c
index a12012d..72a0489 100644
--- a/phper-sys/php_wrapper.c
+++ b/phper-sys/php_wrapper.c
@@ -50,6 +50,10 @@ phper_init_class_entry_handler(zend_class_entry *class_ce, void *argument);
 #define IS_VOID 0x1D
 #endif
 
+#ifndef ZEND_CALL_MAY_HAVE_UNDEF
+#define ZEND_CALL_MAY_HAVE_UNDEF (1 << 26)
+#endif
+
 // ==================================================
 // zval apis:
 // ==================================================
@@ -198,6 +202,10 @@ void phper_zval_str(zval *zv, zend_string *s) {
     ZVAL_STR(zv, s);
 }
 
+void phper_zval_undef(zval *zv) {
+    ZVAL_UNDEF(zv);
+}
+
 void phper_convert_to_long(zval *op) {
     convert_to_long(op);
 }
@@ -348,6 +356,10 @@ zval *phper_get_this(zend_execute_data *execute_data) {
     return getThis();
 }
 
+zend_class_entry *phper_get_called_scope(zend_execute_data *execute_data) {
+    return zend_get_called_scope(execute_data);
+}
+
 size_t phper_zend_object_properties_size(zend_class_entry *ce) {
     return zend_object_properties_size(ce);
 }
@@ -447,11 +459,39 @@ uint32_t phper_zend_num_args(const zend_execute_data *execute_data) {
     return ZEND_NUM_ARGS();
 }
 
+uint32_t phper_zend_call_num_args(const zend_execute_data *execute_data) {
+    return ZEND_CALL_NUM_ARGS(execute_data);
+}
+
+void phper_zend_set_call_num_args(zend_execute_data *execute_data, uint32_t num) {
+    ZEND_CALL_NUM_ARGS(execute_data) = num;
+}
+
+uint32_t phper_zend_call_info(zend_execute_data *execute_data) {
+    return ZEND_CALL_INFO(execute_data);
+}
+
+void phper_zend_add_call_flag(zend_execute_data *execute_data, uint32_t flag) {
+    ZEND_ADD_CALL_FLAG(execute_data, flag);
+}
+
 bool phper_zend_get_parameters_array_ex(uint32_t param_count,
                                         zval *argument_array) {
     return zend_get_parameters_array_ex(param_count, argument_array) != 0;
 }
 
+uint32_t phper_zend_call_may_have_undef() {
+    return ZEND_CALL_MAY_HAVE_UNDEF;
+}
+
+int phper_zend_result_success() {
+    return SUCCESS;
+}
+
+int phper_zend_result_failure() {
+    return FAILURE;
+}
+
 // ==================================================
 // memory apis:
 // ==================================================
diff --git a/phper/src/functions.rs b/phper/src/functions.rs
index 498568b..7bd873e 100644
--- a/phper/src/functions.rs
+++ b/phper/src/functions.rs
@@ -629,6 +629,11 @@ impl ZFunc {
         }
     }
 
+    /// Detects if the function is static.
+    pub fn is_static(&self) -> bool {
+        unsafe { (self.inner.op_array.fn_flags & ZEND_ACC_STATIC) != 0 }
+    }
+
     /// Get the type of the function (sys::ZEND_USER_FUNCTION,
     /// sys::ZEND_INTERNAL_FUNCTION, or sys::ZEND_EVAL_CODE).
     pub fn get_type(&self) -> u32 {
diff --git a/phper/src/values.rs b/phper/src/values.rs
index cb39819..690aed0 100644
--- a/phper/src/values.rs
+++ b/phper/src/values.rs
@@ -12,6 +12,7 @@
 
 use crate::{
     arrays::{ZArr, ZArray},
+    classes::ClassEntry,
     errors::ExpectTypeError,
     functions::{ZFunc, call_internal},
     objects::{StateObject, ZObj, ZObject},
@@ -177,17 +178,23 @@ impl ExecuteData {
 
     /// Gets associated `$this` object if exists.
     pub fn get_this(&mut self) -> Option<&ZObj> {
-        unsafe {
-            let val = ZVal::from_ptr(phper_get_this(&mut self.inner));
-            val.as_z_obj()
-        }
+        unsafe { ZVal::try_from_ptr(phper_get_this(&mut self.inner))?.as_z_obj() }
     }
 
     /// Gets associated mutable `$this` object if exists.
     pub fn get_this_mut(&mut self) -> Option<&mut ZObj> {
+        unsafe { ZVal::try_from_mut_ptr(phper_get_this(&mut self.inner))?.as_mut_z_obj() }
+    }
+
+    /// Gets associated called scope if it exists
+    pub fn get_called_scope(&mut self) -> Option<&ClassEntry> {
         unsafe {
-            let val = ZVal::from_mut_ptr(phper_get_this(&mut self.inner));
-            val.as_mut_z_obj()
+            let ptr = phper_get_called_scope(&mut self.inner);
+            if ptr.is_null() {
+                None
+            } else {
+                Some(ClassEntry::from_ptr(ptr))
+            }
         }
     }