php - false 时继续执行代码

Question

你能帮我解决这个问题吗？我有这个代码:

foreach ($mat_desc as $mat_key => $materials) {
    $mat = explode(' | ', $materials);
    $mat_d = $mat[0];
    $mat_u = $mat[1];
    $m = mat_id_from_mat_desc($mat_d, $mat_u);

    $cur = mysql_result(mysql_query('SELECT `req_id` FROM `requestdetails` JOIN `request` USING(`req_id`) WHERE `proj_id` = "'.$proj_id.'" AND `mat_id` = "'.$m.'" AND `req_qty` <> `current_rec_qty` ORDER BY `req_id` DESC'), 0);
    echo $cur;
    if(mysql_num_rows($cur) == 0){
        exit;
    }

    mysql_query ("INSERT INTO `receive` (`proj_id`,`rec_code`) VALUES ('$proj_id','$rec_code')");       

    $rec_id = mysql_insert_id();    

我想要实现的是，当 $cur 没有任何行时，它将退出循环并且不会继续执行其余代码。但如果它确实有任何行，它将继续并执行插入查询。预先感谢您。

Answer 1

我假设您的意思是您不想在 foreach 语句中为该项目执行 INSERT 。如果是这种情况，请将 exit; 更改为 continue;，这将指示 PHP 停止执行循环中当前项目的代码，在循环中前进一个元素并开始再次从顶部开始。

您还应该更改:

$cur = mysql_result(mysql_query('SELECT `req_id` FROM `requestdetails` JOIN `request` USING(`req_id`) WHERE `proj_id` = "'.$proj_id.'" AND `mat_id` = "'.$m.'" AND `req_qty` <> `current_rec_qty` ORDER BY `req_id` DESC'), 0);

至:

 $cur = mysql_query('SELECT `req_id` FROM `requestdetails` JOIN `request` USING(`req_id`) WHERE `proj_id` = "'.$proj_id.'" AND `mat_id` = "'.$m.'" AND `req_qty` <> `current_rec_qty` ORDER BY `req_id` DESC');