mysql_num_rows() returns the number of rows in a result set. This command is only valid for SELECT statements. To retrieve the number of rows affected by a INSERT, UPDATE or DELETE query, use mysql_affected_rows().
$result = mysql_query("SELECT * FROM table1", $link); $num_rows = mysql_num_rows($result);
echo "$num_rows Rows\n";
?>
Note: If you use mysql_unbuffered_query(), mysql_num_rows() will not return the correct value until all the rows in the result set have been retrieved.
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