得到通知未定义索引

Question

我已阅读以下内容 PHP: "Notice: Undefined variable", "Notice: Undefined index", and "Notice: Undefined offset" 但是我还没有弄清楚我的问题所在。

我得到下面的 notice:undefined 索引，据我所知我已经定义了 infoID：

Notice: Undefined index: infoID in C:\xampp\htdocs\WebDevelopment\Bathrooms\functions.php on line 193

function info_byidx($sql) {
            include 'connect.php';
    $id = $_GET['infoID'];
    $select = $conn->prepare($sql);
    $select->bind_param('s', $id);
    $select->execute();
    $select->store_result();
    if ($select->num_rows > 0) {
        $meta = $select->result_metadata();
        while ($field = $meta->fetch_field()) {
            $params[] = &$row[$field->name];
        }
        call_user_func_array(array($select, 'bind_result'), $params);
        while ($select->fetch()) {
            if ($row['title'] == "NULL") {
                echo "<h3>".$row['subtitle']."</h3>\n<p>".$row['content']."</p>\n";
            }
            else if ($row['subtitle'] == "NULL") {
                echo "<h2>".$row['title']."</h2>\n<p>".$row['content']."</p>\n";
            }
            else {
            echo "<h2>".$row['title']."</h2>\n<h3>".$row['subtitle']."</h3>\n<p>".$row['content']."</p>\n";
            }

        }
        $select->close();
    }

}

infoID 通过以下方式定义：

http://localhost:1234/WebDevelopment/Bathrooms/info.php?pageID=2?infoID=x -- where is the value of generalID

Answer 1

http://localhost:1234/WebDevelopment/Bathrooms/info.php?pageID=2?infoID=x

修正为

http://localhost:1234/WebDevelopment/Bathrooms/info.php?pageID=2&infoID=x

就一个？首先，然后使用 & 分隔下一个 key=values.

得到通知未定义索引

getting notice undefined index

php

notice