PHP 和 MySQL：mysqli_num_rows（）期望参数 1 mysqli_result，给定布尔值

php mysql

2022-08-30 09:59:21

我正在尝试将HTML净化器 http://htmlpurifier.org/ 集成以过滤用户提交的数据，但我在下面收到以下错误。我想知道如何解决这个问题？

我收到以下错误。

on line 22: mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given

第 22 行是。

if (mysqli_num_rows($dbc) == 0) {

这是php代码。

if (isset($_POST['submitted'])) { // Handle the form.

    require_once '../../htmlpurifier/library/HTMLPurifier.auto.php';

    $config = HTMLPurifier_Config::createDefault();
    $config->set('Core.Encoding', 'UTF-8'); // replace with your encoding
    $config->set('HTML.Doctype', 'XHTML 1.0 Strict'); // replace with your doctype
    $purifier = new HTMLPurifier($config);


    $mysqli = mysqli_connect("localhost", "root", "", "sitename");
    $dbc = mysqli_query($mysqli,"SELECT users.*, profile.*
                                 FROM users 
                                 INNER JOIN contact_info ON contact_info.user_id = users.user_id 
                                 WHERE users.user_id=3");

    $about_me = mysqli_real_escape_string($mysqli, $purifier->purify($_POST['about_me']));
    $interests = mysqli_real_escape_string($mysqli, $purifier->purify($_POST['interests']));



if (mysqli_num_rows($dbc) == 0) {
        $mysqli = mysqli_connect("localhost", "root", "", "sitename");
        $dbc = mysqli_query($mysqli,"INSERT INTO profile (user_id, about_me, interests) 
                                     VALUES ('$user_id', '$about_me', '$interests')");
}



if ($dbc == TRUE) {
        $dbc = mysqli_query($mysqli,"UPDATE profile 
                                     SET about_me = '$about_me', interests = '$interests' 
                                     WHERE user_id = '$user_id'");

        echo '<p class="changes-saved">Your changes have been saved!</p>';
}


if (!$dbc) {
        // There was an error...do something about it here...
        print mysqli_error($mysqli);
        return;
}

}

答案 1

$dbc返回 false。您的查询中存在错误：

SELECT users.*, profile.* --You do not join with profile anywhere.
                                 FROM users 
                                 INNER JOIN contact_info 
                                 ON contact_info.user_id = users.user_id 
                                 WHERE users.user_id=3");

Raveren已经描述了对此的一般修复。

答案 2

查询要么不返回任何行，要么是错误的，因此返回。将其更改为FALSE

if (!$dbc || mysqli_num_rows($dbc) == 0)

mysqli_num_rows:

返回值

成功时返回 TRUE，失败时返回 FALSE。对于 SELECT、SHOW、DESCRIBE 或 EXPLAIN mysqli_query（）将返回一个结果对象。

PHP 和 MySQL：mysqli_num_rows（） 期望参数 1 mysqli_result，给定布尔值

PHP 和 MySQL：mysqli_num_rows（）期望参数 1 mysqli_result，给定布尔值