搜索引擎脚本 - 未定义的变量

Question

我的代码中有一个小问题，我无法弄清楚它是什么..

我正在尝试用PHP制作一个示例搜索引擎工具，一切正常，直到我试图从数据库中搜索一些帖子...当我这样做时，它说我没有$ header和$生物宣布...

<?php

include('connection.php');

$query =mysqli_real_escape_string($dbc, $_POST['query']);

$q = mysqli_query($dbc, "SELECT id FROM search WHERE header LIKE '%$query%' OR bio LIKE '%$query%'");


$num = mysqli_num_rows($q);

echo $num;

if(!$query){
echo "Enter a query...";
} else {

if($num != 0)
{

    echo "<hr>";
    while ($fetch = mysqli_fetch_assoc($q)){

       $id = $fetch['id'];
        $header = $fetch['header'];
        $bio = $fetch['bio'];


    echo "<strong>" . $header . "</strong>";
    echo "<blockquote><p>" . $bio . "</p></blockquote>";
    echo "<hr>";

    }

} else {
    echo "No results where found .. ";
}

}

?>

和表格

<div style = "width:300px; margin:auto;">

    <h1> Add Search Criteria</h1>
    <p> Type a header and bio below to add to search engine</p>

    <p>
        <input id="header" name = "header" type="text" placeholder="header" style="width:100%;">
    </p>

    <p>
        <textarea id="bio" name="bio" cols="40" rows="7" placeholder="Write a bio.."></textarea>
    </p>

    <p>
        <center>
            <button id="submit">Submit Search</button>
        </center>
    </p>

    <div id="add_error" style="text-align:center"></div>

    <hr>

    <h1>Search The Database</h1>
    <p>Please type something to search to database</p>

    <p>
        <input name = "query" id="query" type="text" placeholder="search">
        <button id="search">Search</button>
    </p>

    <div id="search_error">

    </div>

</div>

这是它的输出

注意：未定义的索引：第25行的C：\ wamp64 \ www \ mywebsite \ Search \ search.php中的标题 调用堆栈

时间记忆功能位置

1 0.0021 242472 {main}（）... \ search.php：0

（！）注意：第26行的C：\ wamp64 \ www \ mywebsite \ Search \ search.php中的未定义索引：bio 调用堆栈

时间记忆功能位置

1 0.0021 242472 {main}（）... \ search.php：0

Answer 1

在您选择的查询中添加标题和生物列。

$q = mysqli_query($dbc, "SELECT id, header, bio FROM search WHERE header LIKE '%$query%' OR bio LIKE '%$query%'");