致命错误:调用未定义的方法mysqli :: num_rows() [英] Fatal error: Call to undefined method mysqli::num_rows()

问题描述

我正在寻求有关PHP的帮助.我检查了一下代码，发现其中没有任何错误.

Hi I am requesting help with my PHP. I checked the code through and I couldn't spot any errors in it.

我对PHP不太满意，希望你们中的任何人都能帮忙.

I'm not that great with PHP, and I hope any of you could help.

它应该返回false或true，但我收到此错误

It should return either false or true but, I get this error

Fatal error: Call to undefined method mysqli::num_rows()

这是我的代码:

$mysqli是我的mysqli数据库连接器.

$mysqli is my mysqli database connector.

$email = $_SESSION["email"];

function isbanned($email){
    global $mysqli;
    if($mysqli->num_rows("SELECT * FROM `user_bans` WHERE `banned_id` = '".$email."' LIMIT 1") > 0){
        return true;
    }
    return false;
}

isbanned($email);

这就是我所有被禁止脚本的代码.

That's all my code for the banned script.

提前谢谢.

推荐答案

那不是使用该函数的方式.首先，您执行查询，然后然后检查以查看从返回的结果对象返回了多少行:

That's not how that function is used. First you execute your query and then you check to see how many rows were returned from the returned result object:

$result = $mysqli->query("SELECT * FROM `user_bans` WHERE `banned_id` = '".$email."' LIMIT 1");
if($result->num_rows > 0){
    return true;
}

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