When using FETCH_DEFAULT, instead of setting the mode to a default value, it was modified so that the default value is not overridden.

Author: SakiTakamachi

ext/pdo/pdo_stmt.c

@@ -1626,7 +1626,7 @@ bool pdo_stmt_setup_fetch_mode(pdo_stmt_t *stmt, zend_long mode, uint32_t mode_a
 
 	pdo_stmt_free_default_fetch_mode(stmt);
 
-	stmt->default_fetch_type = PDO_FETCH_BOTH;
+	stmt->default_fetch_type = stmt->dbh->default_fetch_type;
 
 	flags = mode & PDO_FETCH_FLAGS;
 
@@ -1638,6 +1638,8 @@ bool pdo_stmt_setup_fetch_mode(pdo_stmt_t *stmt, zend_long mode, uint32_t mode_a
 		return false;
 	}
 
+	bool use_default = (mode & ~PDO_FETCH_FLAGS) == PDO_FETCH_USE_DEFAULT;
+
 	switch (mode & ~PDO_FETCH_FLAGS) {
 		case PDO_FETCH_USE_DEFAULT:
 		case PDO_FETCH_LAZY:
@@ -1754,7 +1756,9 @@ bool pdo_stmt_setup_fetch_mode(pdo_stmt_t *stmt, zend_long mode, uint32_t mode_a
 			return false;
 	}
 
-	stmt->default_fetch_type = mode;
+	if (!use_default) {
+		stmt->default_fetch_type = mode;
+	}
 
 	return true;
 }