Question

我在php服务器上使用代码，可以帮助为iphone应用程序创建收藏列表事件。但是，我收到错误说

Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in /home/content/10/10898710/html/dealapp/favoriteevent.php on line 6
Warning: Cannot modify header information - headers already sent by (output started at /home/content/10/10898710/html/dealapp/favoriteevent.php:6) in /home/content/10/10898710/html/dealapp/favoriteevent.php on line 13
"favorite event list":"No event favorite"}

我使用的脚本是：

<?php
        require_once('config.php'); //cre
        $userid = $_REQUEST['userid'];
                $selectfavorite = mysql_query("select a.eventid, a.favorite, a.userid, b.* from favoriteevent as a, event as b where a.eventid = b.id and a.userid = '".$userid."'");
            $posts = array();
            if(mysql_num_rows($selectfavorite)) {
                while($post = mysql_fetch_assoc($selectfavorite)) {
                    $posts[] = $post;
                }
                header('Content-type: application/json');
                echo(json_encode(array('favorite event list'=>$posts)));
            } else {
            header('Content-type: application/json');
                echo (json_encode(array('favorite event list'=>'No event favorite')));

            }
        ?>

如果有人能帮助我，我将不胜感激。

Answer 1

您应首先检查$ selectFavourite是否为false。如果查询有一些错误，它将返回false。然后你可以继续前进。另外，检查您的查询是否正常。

$selectfavorite = mysql_query("select a.eventid, a.favorite, a.userid, b.* from favoriteevent as a, event as b where a.eventid = b.id and a.userid = '".$userid."'");
if($selectFavourite !== false)
{

}

Answer 2

您必须传递mysql_num_rows查询结果的资源标识符。

$ result = mysql_query（...）; $ numRows = mysql_num_rows（$ result）;

如何处理mysql_num_rows（）期望参数错误

2 个答案: