我创建了一个星级评分系统。第一个函数在数据库中插入数据时，第二个函数显示弹出并从注释区域中提取单词然后设置特定的评级，第三个函数取数据库中所有评级存储的平均值。我的问题是这个，当我打电话给平均功能评级星时自动向下移动。请帮我跟踪代码，找出我的错误或编码缺陷。如果有人能帮助我，我将感激不尽。
<!Doctype html>
<html>
<head>
<title>comments systems</title>
</head>
<body>
<h1 >this is comments system</h1>
<?php
include 'comments1.php';
echo"<form method='post' action='".set()."'>
<label>Email</label>
<input type='email' name='email' placeholder='Your mail..' required >
<br>
<label for='subject'>Subject</label>
<textarea name='mess' placeholder='this is text' rows='5' cols='50' required></textarea>
<input type='submit' name='Submit'>
</form>";
get();//message and mail taking
rating();
// echo
$rating=average();
$resrat=round($rating);
echo"<div style='margin-left: 115px; margin-top: 2370px;'>";
echo"---";
for($i=1; $i<=$resrat; $i++) // simple for loop
{
echo '<img src="Star (Full).png" width="100"/>';
}
echo"</div>";
?>
</body>
</html>
//第二个文件
<?php
session_start();
function set()
{
$Mail = isset($_POST['email']) ? $_POST['email'] : '';
$MESS=isset($_POST['mess']) ? $_POST['mess'] : '';
$conn=mysqli_connect('localhost','root');
mysqli_select_db($conn,'reg');
if(!empty($Mail && $MESS))
{
$sql="INSERT INTO Persons (email,message,curdate)VALUES ('$Mail', '$MESS',now())";//ID is auto increment due to this not mention.
if(mysqli_query($conn,$sql))
{
//echo "data submited";Nothing do here
}
else {
//echo "data not submited";
echo "<link rel='stylesheet' type='text/css' href='sweet-alert.css''>";
echo "<script src='sweet-alert.js'></script>";
echo '<script type="text/javascript">';
echo 'setTimeout(function () {swal("Data Not Submited!");';
echo '}, );</script>';
}
}
}
function get(){
$con=mysqli_connect('localhost','root');
mysqli_select_db($con,'reg');
$page=$_GET["page"]; //this page is that link where we click on
if($page==" "||$page=="1")
{
$pageget=0;
}
else
{
$pageget= ($page*5)-5;
}
if($con)
{
$sql="SELECT * FROM Persons LIMIT $pageget, 5";
$res=mysqli_query($con,$sql);
while($row=mysqli_fetch_array($res))
{
echo date("Y/m/d");
echo "<br>";
echo $row['message'];
echo "<br>";
echo "<hr>";
}
$sql="SELECT * FROM Persons";
$res1=mysqli_query($con,$sql) or die(mysqli_error($con));
$cnt=mysqli_num_rows($res1);//cnt=counting
echo "<br>";
$totalpages=floor($cnt/5);
//echo $totalpages;
$current_page = isset($_GET['page']) ? $_GET['page'] : 1;
if( $current_page > 1 )
{
$prev = '<a href="comments.php?page='.($current_page-1).'"><div style="border-style: groove; float:left " >Previous</div></a>';
echo $prev;
}
for($page=1;$page<=$totalpages;$page++)
{
?>
<a href="comments.php?page=<?php echo $page." ";?>" style="text-decoration:none text-align:center;"><?php echo '<div style="border-style: groove; width:25px;float:left" >'. $page." ".'</div>'; ?></a><?php
}
if( $current_page < $totalpages )
{
$next = '<a href="comments.php?page='.($current_page+1).'"><div style="border-style: groove;float:left" >Next</div></a>';
echo $next;
}
}
}
function rating()
{
$Mail=isset($_POST['email']) ? $_POST['email'] : '';
$MESS=isset($_POST['mess']) ? $_POST['mess'] : '';
$conn=mysqli_connect('localhost','root');
mysqli_select_db($conn,'reg');
//if(empty($Mail && $MESS)){echo "sorry";}
if(!empty($Mail && $MESS))
//else
{
echo "<br>";
$Email=$Mail;
// echo $Email;
$string=$MESS;
//FIRST
if (strpos($string, 'VERY GOOD') ||strpos($string, 'very good')||strpos($string, 'spacious')||strpos($string, 'Bravo') ||strpos($string, 'Very Good')||strpos($string, 'bravo')!== false)
{
//echo '3';
// echo
$rating=4;
$sql="UPDATE Persons SET Rating=$rating WHERE email='$Email';"; // if remove this '' from varible'$Email' it not work becacuse it was string.
if(mysqli_query($conn,$sql))
{
//echo "yes added rating";
echo "<link rel='stylesheet' type='text/css' href='sweet-alert.css''>";
echo "<script src='sweet-alert.js'></script>";
echo '<script type="text/javascript">';
echo 'setTimeout(function () {swal("Your Feedback Considered = 4 Star!");';
echo '}, );</script>';
}
else
{
// echo " not rating added".error;
echo "<link rel='stylesheet' type='text/css' href='sweet-alert.css''>";
echo "<script src='sweet-alert.js'></script>";
echo '<script type="text/javascript">';
echo 'setTimeout(function () {swal("Your Feedback Not Considerd!");';
echo '}, );</script>'.error;
}
}
//SECOND
else if(strpos($string, 'GOOD') ||strpos($string, 'good')||strpos($string, 'not bad')||strpos($string, 'Not Bad')!== false)
{
// echo "your feed back has no our required words! at least one is required";
//echo
$rating=3;
$sql="UPDATE Persons SET Rating=$rating WHERE email='$Email';"; // if remove this '' from varible'$Email' it not work becacuse it was string.
if(mysqli_query($conn,$sql))
{
echo "<link rel='stylesheet' type='text/css' href='sweet-alert.css''>";
echo "<script src='sweet-alert.js'></script>";
echo '<script type="text/javascript">';
echo 'setTimeout(function () {swal("Your Feedback Considered = 3 Star!");';
echo '}, );</script>';
}
else
{
echo "<link rel='stylesheet' type='text/css' href='sweet-alert.css''>";
echo "<script src='sweet-alert.js'></script>";
echo '<script type="text/javascript">';
echo 'setTimeout(function () {swal("Your Feedback Not Considerd!");';
echo '}, );</script>'.error;
}
}
//THIRD
else if(strpos($string, 'Bad') ||strpos($string, 'bad')||strpos($string, 'BAD')!== false)
{
// echo "your feed back has no our required words! at least one is required";
//echo
$rating=2;
$sql="UPDATE Persons SET Rating=$rating WHERE email='$Email';"; // if remove this '' from varible'$Email' it not work becacuse it was string.
if(mysqli_query($conn,$sql))
{
echo "<link rel='stylesheet' type='text/css' href='sweet-alert.css''>";
echo "<script src='sweet-alert.js'></script>";
echo '<script type="text/javascript">';
echo 'setTimeout(function () {swal("Your Feedback Considered = 2 Star!");';
echo '}, );</script>';
}
else
{
echo "<link rel='stylesheet' type='text/css' href='sweet-alert.css''>";
echo "<script src='sweet-alert.js'></script>";
echo '<script type="text/javascript">';
echo 'setTimeout(function () {swal("Your Feedback Not Considerd!");';
echo '}, );</script>'.error;
}
}
//FORTH
else if(strpos($string, 'very bad') ||strpos($string, 'VERY BAD')||strpos($string, 'so bad')||strpos($string, 'Very Bad')||strpos($string, 'So Bad')!== false) {
// echo "your feed back has no our required words! at least one is required";
//echo
$rating=1;
$sql="UPDATE Persons SET Rating=$rating WHERE email='$Email';"; // if remove this '' from varible'$Email' it not work becacuse it was string.
if(mysqli_query($conn,$sql))
{
echo "<link rel='stylesheet' type='text/css' href='sweet-alert.css''>";
echo "<script src='sweet-alert.js'></script>";
echo '<script type="text/javascript">';
echo 'setTimeout(function () {swal("Your Feedback Considered = 1 Star!");';
echo '}, );</script>';
}
else {
echo "<link rel='stylesheet' type='text/css' href='sweet-alert.css''>";
echo "<script src='sweet-alert.js'></script>";
echo '<script type="text/javascript">';
echo 'setTimeout(function () {swal("Your Feedback Not Considerd!");';
echo '}, );</script>'.error;
}
}
//FIFTH
else if(strpos($string, 'excellent') ||strpos($string, 'EXCELLENT')||strpos($string, 'Perfect')||strpos($string, 'Excellent')||strpos($string, 'perfect')!== false) {
// echo "your feed back has no our required words! at least one is required";
//echo
$rating=5;
$sql="UPDATE Persons SET Rating=$rating WHERE email='$Email';"; // if remove this '' from varible'$Email' it not work becacuse it was string.
if(mysqli_query($conn,$sql))
{
echo "<link rel='stylesheet' type='text/css' href='sweet-alert.css''>";
echo "<script src='sweet-alert.js'></script>";
echo '<script type="text/javascript">';
echo 'setTimeout(function () {swal("Your Feedback Considered = 5 Star!");';
echo '}, );</script>';
}
else {
echo "<link rel='stylesheet' type='text/css' href='sweet-alert.css''>";
echo "<script src='sweet-alert.js'></script>";
echo '<script type="text/javascript">';
echo 'setTimeout(function () {swal("Your Feedback Not Considerd!");';
echo '}, );</script>'.error;
}
}
//6th
else if(strpos($string, 'excellent') ||strpos($string, 'good')||strpos($string, 'Perfect')||strpos($string, 'bad')||strpos($string, 'perfect')!== true) {
echo $rating=1;
$sql="UPDATE Persons SET Rating=$rating WHERE email='$Email';"; // if remove this '' from varible'$Email' it not work becacuse it was string.
if(mysqli_query($conn,$sql))
{
echo "Rating Considered as low, Please use relevent words";
}
}
}
}
function average()
{
//average calculate
$con=mysqli_connect('localhost','root');
mysqli_select_db($con,'reg');
$sql="SELECT * FROM Persons";
$res1=mysqli_query($con,$sql);
$avg=0;
$count=0;
while($row=mysqli_fetch_array($res1))
{
echo "<br>";
$count+=1;
// echo $count
$avg+=$row['Rating'];
$result=$avg/$count;
}
return $result;
}
?>
答案 0 :(得分：1)
如果你想在php中计算AVG，请更改：
$total=0;
$avg=0;
$count=0;
while($row=mysqli_fetch_array($res1))
{
echo "<br>";
$count+=1;
$avg+=$row['Rating'];
$result=$avg/$count;
}
致：
$totalRate = 0;
$totalRows = $res1->num_rows;
while($row=mysqli_fetch_array($res1))
$totalRate += $row['Rating'];
$avg = $totalRate / $totalRows;
您还可以通过一个查询使用mysql AVG()函数直接计算AVG
https://www.w3schools.com/sql/func_mysql_avg.asp