Description:
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<para><function>mysql_affected_rows</function> does not work with SELECT statements; only on statements which modify records. To retrieve the number of rows returned by a SELECT, use <function>mysql_num_rows</function>.</para>
     Why... this is not TRUE...
     Called after a SELECT query mysql_affected_rows will asta work... and will act just as mysql_num_rows because PHP's mysql_query calls, by default, MySQL's mysql_store_result.
     If and only if the previous SELECT query was sent with mysql_unbuffered_query witch will not call MySQL's mysql_store_result... mysql_affected_rows will return -1 as if an error ocured.

 __2.__
 There is not mentioned that if the previous query was REPLACE... mysql_affected_rows will return doubled results... that is because MySQL will DELETE and INSERT rows... thus making 2 operations...
 
 All this things are also documented in MySQL Reference Manual whitch is a good source for info about mysql functions present in MySQL extension of PHP... not to mention the MySQLi extension.... !
 
 I believe that the above should be included in this functions' documentation !