Create PHP 5.x compatibility macro for ZVAL_UNDEF

Author: jmikola

phongo_compat.h

@@ -130,6 +130,7 @@
 # define ADD_NEXT_INDEX_STRINGL(_zv, _value, _len) add_next_index_stringl(_zv, _value, _len, 1);
 # define Z_PHPDATE_P(object) ((php_date_obj*)zend_object_store_get_object(object TSRMLS_CC))
 # define Z_ISUNDEF(x) !x
+# define ZVAL_UNDEF(x) do { (*x) = NULL; } while (0)
 # define phongo_free_object_arg void
 # define phongo_zpp_char_len int
 # define ZEND_HASH_APPLY_PROTECTION(ht) true

php_phongo.c

@@ -385,11 +385,7 @@ zend_bool phongo_writeconcernerror_init(zval *return_value, bson_t *bson TSRMLS_
 
 		if (!phongo_bson_to_zval(data, len, &intern->info)) {
 			zval_ptr_dtor(&intern->info);
-#if PHP_VERSION_ID >= 70000
 			ZVAL_UNDEF(&intern->info);
-#else
-			intern->info = NULL;
-#endif
 
 			return false;
 		}
@@ -426,11 +422,7 @@ zend_bool phongo_writeerror_init(zval *return_value, bson_t *bson TSRMLS_DC) /*
 
 		if (!phongo_bson_to_zval(data, len, &intern->info)) {
 			zval_ptr_dtor(&intern->info);
-#if PHP_VERSION_ID >= 70000
 			ZVAL_UNDEF(&intern->info);
-#else
-			intern->info = NULL;
-#endif
 
 			return false;
 		}

src/MongoDB/Cursor.c

@@ -44,11 +44,7 @@ static void php_phongo_cursor_free_current(php_phongo_cursor_t *cursor) /* {{{ *
 {
 	if (!Z_ISUNDEF(cursor->visitor_data.zchild)) {
 		zval_ptr_dtor(&cursor->visitor_data.zchild);
-#if PHP_VERSION_ID >= 70000
 		ZVAL_UNDEF(&cursor->visitor_data.zchild);
-#else
-		cursor->visitor_data.zchild = NULL;
-#endif
 	}
 } /* }}} */