chore(agent): remove obsolete code (14/17) (#1083)

This PR removes obsolete `PHP7` codeblocks. PR: 14/17

Author: hahuja2

agent/php_wrapper.c

@@ -209,44 +209,21 @@ nruserfn_t* nr_php_wrap_generic_callable(zval* callable,
 }
 
 inline static void release_zval(zval** ppzv) {
-#ifdef PHP7
   nr_php_zval_free(ppzv);
-#else
-  if (NULL == ppzv) {
-    return;
-  }
-  if (NULL == *ppzv) {
-    return;
-  }
-
-  zval_ptr_dtor(ppzv);
-  *ppzv = NULL;
-#endif /* PHP7 */
 }
 
 zval* nr_php_arg_get(ssize_t index, NR_EXECUTE_PROTO TSRMLS_DC) {
   zval* arg;
   NR_UNUSED_FUNC_RETURN_VALUE;
-#ifdef PHP7
-  {
-    zval* orig;
+  zval* orig;
 
-    arg = NULL;
-    orig = nr_php_get_user_func_arg((zend_uint)index, NR_EXECUTE_ORIG_ARGS);
+  arg = NULL;
+  orig = nr_php_get_user_func_arg((zend_uint)index, NR_EXECUTE_ORIG_ARGS);
 
-    if (orig) {
-      arg = nr_php_zval_alloc();
-      ZVAL_DUP(arg, orig);
-    }
+  if (orig) {
+    arg = nr_php_zval_alloc();
+    ZVAL_DUP(arg, orig);
   }
-#else
-  arg = nr_php_get_user_func_arg((zend_uint)index,
-                                 NR_EXECUTE_ORIG_ARGS TSRMLS_CC);
-
-  if (arg) {
-    Z_ADDREF_P(arg);
-  }
-#endif /* PHP7 */
 
   return arg;
 }
@@ -360,15 +337,8 @@ zval* nr_php_scope_get(NR_EXECUTE_PROTO TSRMLS_DC) {
     return NULL;
   }
 
-#ifdef PHP7
   this_copy = nr_php_zval_alloc();
   ZVAL_DUP(this_copy, this_obj);
-#else
-  NR_UNUSED_SPECIALFN;
-
-  this_copy = this_obj;
-  Z_ADDREF_P(this_copy);
-#endif
 
   return this_copy;
 }
@@ -378,13 +348,9 @@ void nr_php_scope_release(zval** ppzv) {
 }
 
 zval** nr_php_get_return_value_ptr(TSRMLS_D) {
-#ifdef PHP7
   if (NULL == EG(current_execute_data)) {
     return NULL;
   }
 
   return &EG(current_execute_data)->return_value;
-#else
-  return EG(return_value_ptr_ptr);
-#endif /* PHP7 */
 }