MySQL ResultSet - count rows?

Hello,

I am writing the data of a ResultSet object to an array. To declare
the array length, I need to know the number of rows before copying
them - is there a way to read the row count instantly, without having
to iterate anything?

PHP has mysql_count_rows, but I'm not sure what that does internally -
it may just iterate over the data too.

--
Chris
.

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