When to return correct number of rows in mysqli result?

For unbuffered result sets, mysqli_num_rows () will not return the correct number of rows until all the rows in the result have been retrieved. Procedural style only: A mysqli_result object returned by mysqli_query (), mysqli_store_result () , mysqli_use_result () or mysqli_stmt_get_result (). Returns number of rows in the result set.
Similarly, why does mysqli not return the correct number of rows?
Returns the number of rows in the result set. The behaviour of mysqli_num_rows () depends on whether buffered or unbuffered result sets are being used. For unbuffered result sets, mysqli_num_rows () will not return the correct number of rows until all the rows in the result have been retrieved.
And, when to return 0 in mysqli _ result function? This function returns 0 for unbuffered result sets unless all rows have been fetched from the server. Procedural style only: A mysqli_result object returned by mysqli_query (), mysqli_store_result () , mysqli_use_result () or mysqli_stmt_get_result (). An int representing the number of fetched rows.
In this manner, how to retrieve number of rows in MySQL?
mysql_num_rows ( resource $result ) : int. Retrieves the number of rows from a result set. This command is only valid for statements like SELECT or SHOW that return an actual result set. To retrieve the number of rows affected by a INSERT, UPDATE, REPLACE or DELETE query, use mysql_affected_rows().
Thereof, what are the parameters of mysqli _ NUM _ ROWS ( ) function?
Parameters: This function accepts single parameter $result (where $result is a MySQL query set up using mysqli_query ()). It is a mandatory parameter and represents the result set returned by a fetch query in MySQL. Return Value: It returns the number of rows present in a result set.

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