This extension was deprecated in PHP 5.5.0, and it was removed in PHP 7.0.0.
Instead, the MySQLi or PDO_MySQL extension should be used.
See also MySQL: choosing an API guide.
Alternatives to this function include:
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().
Parameters
result
The result resource that
is being evaluated. This result comes from a call to
mysql_query().
Return Values
The number of rows in a result set on success or false on failure.