Add ExecuteData get_argument method.

Author: jmjoy

phper-sys/php_wrapper.c

@@ -184,3 +184,7 @@ void phper_zval_ptr_dtor_nogc(zval *zval_ptr) {
 bool phper_z_refcounted_p(zval *zval_ptr) {
     return Z_REFCOUNTED_P(zval_ptr);
 }
+
+zval *phper_execute_data_call_arg(zend_execute_data *execute_data, int index) {
+    return ZEND_CALL_ARG(execute_data, index);
+}

phper-sys/php_wrapper.h

@@ -64,4 +64,6 @@ void phper_zval_ptr_dtor_nogc(zval *zval_ptr);
 
 bool phper_z_refcounted_p(zval *zval_ptr);
 
+zval *phper_execute_data_call_arg(zend_execute_data *execute_data, int index);
+
 #endif //PHPER_PHP_WRAPPER_H

phper/src/values.rs

@@ -17,6 +17,7 @@ use std::{
     collections::{BTreeMap, HashMap},
     convert::TryInto,
     mem::{transmute, zeroed},
+    os::raw::c_int,
     str,
     str::Utf8Error,
 };
@@ -97,6 +98,13 @@ impl ExecuteData {
         }
         transmute(arguments)
     }
+
+    pub fn get_parameter(&mut self, index: usize) -> &mut Val {
+        unsafe {
+            let val = phper_execute_data_call_arg(self.as_mut_ptr(), index as c_int);
+            Val::from_mut_ptr(val)
+        }
+    }
 }
 
 /// Wrapper of [crate::sys::zval].