mysqli_stmt_affected_rows mysqli_stmt->affected_rows Returns the total number of rows changed, deleted, or inserted by the last executed statement Procedural style : mixedmysqli_stmt_affected_rows objectstmt Object oriented style (property): stmt mixedaffected_rows mysqli_stmt_affected_rows returns the number of rows affected by INSERT, UPDATE, or DELETE query. If the last query was invalid, this function will return -1. For SELECT statements mysqli_affected_rows works like mysqli_num_rows. The mysqli_stmt_affected_rows function only works with queries which update a table. In order to return the number of rows from a SELECT query, use the mysqli_stmt_num_rows function instead. An integer greater than zero indicates the number of rows affected or retrieved. Zero indicates that no records where updated for an UPDATE/DELETE statement, no rows matched the WHERE clause in the query or that no query has yet been executed. -1 indicates that the query has returned an error. If the number of affected rows is greater than maximal PHP int value, the number of affected rows will be returned as a string value. mysqli_stmt_num_rows, mysqli_prepare