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mysql_affected_rows的疑惑

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Release: 2016-06-13 12:42:32
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mysql_affected_rows的困惑
手册上说:
mysql_affected_rows
取得最近一次与 link_identifier 关联的 INSERT,UPDATE 或 DELETE 查询所影响的记录行数。如果是SELECT 查询则使用mysql_num_rows()
但是为什么执行select的时候使用mysql_affected_rows也OK呢?

<br />
$sql="select id,name,age,sex from xtable";<br />
$result=mysql_query($sql);<br />
$rows = mysql_affected_rows();<br />
if($result && $rows ){<br />
    var_dump($rows);//输出结果的确是查询到的结果的行数<br />
}
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