从manual上知道了mysql_affected_rows函数当UPDATE前后的数据一样时会返回异常值,
下面有个方便的解决办法,从官方munual上看到 bdobrica at gmail dot com 留言的:
As a solution to the problem pointed in the post reffering to mysql_affect
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ed_rows() returning 0 when you are making an update query and the fields are not modified although the query is valid, i’m posting the following function. It is very simple and based on a previous post.
<BR>function mysql_modified_rows () { <BR>$info_str = mysql_info(); <BR>$a_rows = mysql_affected_rows(); <BR>ereg("Rows matched: ([0-9]*)", $info_str, $r_matched); <BR>return ($a_rows < 1)?($r_matched[1]?$r_matched[1]:0):$a_rows; <BR>} <BR>
PS:因为这个小问题折腾了半天,感觉php真是太不清晰了