Add helper method for function table

src/zend/globals.rs

@@ -51,6 +51,16 @@ impl ExecutorGlobals {
         unsafe { self.class_table.as_ref() }
     }
 
+    /// Attempts to retrieve the global functions hash table.
+    pub fn function_table(&self) -> Option<&ZendHashTable> {
+        unsafe { self.function_table.as_ref() }
+    }
+
+    /// Attempts to retrieve the global functions hash table as mutable.
+    pub fn function_table_mut(&self) -> Option<&mut ZendHashTable> {
+        unsafe { self.function_table.as_mut() }
+    }
+
     /// Attempts to retrieve the global constants table.
     pub fn constants(&self) -> Option<&ZendHashTable> {
         unsafe { self.zend_constants.as_ref() }