我一直收到错误消息
"注意：第8行/Applications/MAMP/htdocs/project1/rate.php中的未定义变量：pos"。
我在第5行收到了这个错误，但我已经包含了资产功能，我被卡住了，不知道如何修复这个错误。我将在下面张贴代码，请帮忙。
提前感谢
Rate.php页面
<?php
$mysqli = new mysqli("localhost","root","root", "rating") or die ("Couldnt connect to the database!");
if (isset($_POST['pos']))
$post_rating = $_POST['rating'];
$find_data = $mysqli->query("SELECT * FROM rates WHERE pos='$pos'");
while($row = $mysqli->fetch_assoc($find_data))
{
$id = $row['id'];
$current_rating = $row['rating'];
$current_hits = $row['hits'];
}
$new_hits = $current_hits + 1;
$update_hits = $mysqli->query("UPDATE rates SET hits = '$new_hits' WHERE id='$id'");
$pre_rating = $current_rating + $post_rating;
$new_rating = $pre_rating / $new_hits;
$update_rating = $mysqli->query("UPDATE rates SET rating = '$new_rating' WHERE id='$id'");
?>
**FGLRANK.php page**
<!DOCTYPE html>
<html lang="en">
<head>
<title>Football's Greatest Legends Ranking</title>
<meta charset="utf-8" />
<link rel="stylesheet" href="style1.css" type="text/css" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body class="body">
<header class="mainheader">
<center>
<img src="ball.jpg" width="400" height="150" alt="Ron"align="">
</center>
<center>
<font color="white" "arial" size= "6"> <b> Greatest Footballing Legends - You Decide!! </b> </font>
</center>
<nav><ul>
<li> <a href="home.html">Home</a></li>
<li> <a href="fgl.html">Football Legends</a></li>
<li><a href="fglrank.php">Football Legends Ranking</a></li>
<li><a href="contact.html">Contact</a></li>
</ul></nav>
</header>
<div class="mainContent">
<div class="content">
<article class="topcontent">
<header>
<h2> <center> <font color="black" "arial" size= "3"> <b> <i> Legends Ranking! </i> </b> </font> </center> </h2>
</header>
<center>
<content>
<?php
$mysqli = new mysqli("localhost","root","root", "rating") or die ("Couldnt connect to the database!");
$find_data = $mysqli->query("SELECT * FROM rates");
while($row = mysqli_fetch_assoc($find_data))
{
$id = $row['id'];
$nameofplayer = $row['nameofplayer'];
$pos = $row['pos'];
$current_rating = $row['rating'];
$hits = $row['hits'];
echo "
<form action='rate.php' method='POST'>
$nameofplayer: <select name='rating'>
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
<option>6</option>
<option>7</option>
<option>8</option>
<option>9</option>
<option>10</option>
</select>
<input type='hidden' value='$nameofplayer' name='nameofplayer'>
<input type='submit' value='Rate!'> Current Rating: "; echo $current_rating; echo "
</form>
";
}
?>
</content>
</center>
<footer>
<p class="post-info">Greatest Legends of the game</p>
</footer>
</article>
<article class="bottomcontent">
<header>
<h2><a href="#" title="Second post">Second post</a></h2>
</header>
<footer>
<p class="post-info">This post is written by Naz</p>
</footer>
<content>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. </p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. </p>
</article>
</div>
</div>
<aside class="top-sidebar">
<article>
<h2>Top sidebar</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. </p>
</article>
</aside>
<aside class="middle-sidebar">
<article>
<h2>Middle sidebar</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
</article>
</aside>
<aside class="bottom-sidebar">
<article>
<h2>Bottom sidebar</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
</article>
</aside>
<footer class="mainFooter">
<p>Copyright © 2013<a href="#" title="1stwebdesigner">1stwebdesigner.com</a></p>
</footer>
</body>
</html>
// line 8
$mysqli->query("SELECT * FROM rates WHERE pos='$pos'");
但是，您没有设置$pos，因此出现了通知。
我想你是想用$_POST['pos']。
此外，请花时间阅读有关SQL注入的内容，并相应地更新您的代码。