mysql_query(query) => mysqli_query(connection, query)
mysql_fetch_assoc => mysqli_fetch_assoc
mysql_fetch_array => mysqli_fetch_array
mysql_num_rows => mysqli_num_rows
mysql_affected_rows() => mysqli_affected_rows(connection)
mysql_data_seek => mysqli_data_seek
ereg(pattern, source) => preg_match(/pattern/, source)